Psalm 71 is a noble psalm with no stated author (although verses 1 to 3 are very similar to part of psalm 31, a psalm of David). It has the themes of giving our trust to the Lord at all times, and of the passage through our life, from birth through to being elderly and grey-haired. The Lord is described as our rock and our fortress.

It brings out the well-founded truth that in old age, having lived for many years and having gone through all kinds of different experiences, there is often a coming into wisdom which is not present in earlier life.

This is also a psalm expressing the certainty of being able to depend on the Lord, that when we turn to Him to bring us back from whatever false or apparent thoughts, fears, and sensations we're having. Words and phrases such as ‘never’, ‘continually’, ‘all the day’, ‘on every side’ ring through the psalm. (Arcana Caelestia 8066-8067)

The speaker is keenly aware of his adversaries, yet he declares ‘I have become a wonder to many’. This ‘wonder’ could be due to the sheer number of attacks on him, or to his resilience when attacked. It gives us some sense of the inner state of Jesus during his life in the world, too, where no one would have been able to know his full state but could only marvel. He saw all his states portrayed throughout the psalms. (Arcana Caelestia 1690)

The psalm begins with an acknowledgement of the Lord’s power to bring us from dark into light, from fear into security and strength. The words, “You have given the commandment to save me” are not an absolute decree of our salvation, because that would transgress our spiritual freedom. It is the divine promise of salvation when we will it and act to receive it. (Divine Providence 325)

This theme continues, declaring the experience of deliverance, hope, trust and being upheld by God. This is from ‘birth’ and ‘from out of my mother’s womb’. These physical images stand for the first states of our regeneration of our spiritual birth, and being born and delivered from our first natural states of our proprium and selfhood. (Arcana Caelestia 4918.2)

Next comes the idea of our “old age”. This is linked with the onslaught of evil which, on seeing frailty, seeks to undermine and destroy. “Old age”, understood spiritually, means the end of a previous state and the start of a new state, a further period in our regeneration. (Arcana Caelestia 3492) The references to enemies, adversaries and ‘those who lie in wait for my life’ stand for the experience of temptation – especially the Lord in his temptation – that we have no power to withstand on our own, but are frail.

Verses 12 to 16 are a series of short, sharp affirmations of certainty of the Lord’s help and our hope. Spiritual hope is to put ourselves fully in the Lord’s providence and care while we yet determine to live according to his commands. It is not a resignation, but a firming up. (Arcana Caelestia 3913)

Then we come back to the idea of our youth and our old age being the remembrance of the Lord’s guidance and leading all through our life. And, as before, we have the prayer to be upheld so that the coming generations – which are our future states – will come to be from our present love and faith in the Lord. (True Christian Religion 584)

From verse 19 to the end there is a eulogy of praise to the Lord, first for what He has done and always will do for us, and then our response, pictured by playing the lute and the harp, and by singing and speaking all the day long. Stringed musical instruments stand for our acknowledgement of and affection for spiritual truths, while singing and speaking refer more to our desire to live these truths. (Apocalypse Explained 323)

323. Having every one harps, signifies confession from spiritual truths. This is evident from the signification of a "harp," as being confession from spiritual truths. This is signified by "harps," because the harp was a stringed instrument, and by such instruments spiritual things, or those that are of truth, are signified, while wind instruments signify celestial things, or those that are of good. Such things are signified by musical instruments because of their sounds, for sound corresponds to the affections; moreover in heaven affections are perceived by sounds; and because there are various affections, and various sounds are produced by musical instruments, therefore these instruments, by correspondence and consequent agreement, signify affections. In general, stringed instruments signify such things as belong to the affections of truth, and wind instruments such as belong to the affections of good; or, what is the same, some instruments belong to the spiritual class, and some to the celestial class. That sounds correspond to the affections has been made evident to me by much experience, so also musical tones; also that angels are affected in accordance with sounds and their variations; but to recite all such experience would occupy too much space. I will mention only, what is a matter of general observation, that discrete sounds excite the affections of truth, that is, those are affected by them who are in the affections of truth; while continuous sounds excite the affections of good, that is, those are affected by them who are in the affections of good. Whether you say the affections of truth or things spiritual, it is the same, or whether you say the affections of good or things celestial, it is the same. (But these things can be better comprehended from what has been related from experience respecting sounds and their correspondence with affections, in the work on Heaven and Hell 241.)

From this it can now be seen why in the Word, and especially in David, so many kinds of musical instruments are mentioned, as psalteries, harps, flutes, cymbals, timbrels, horns, organs, and others, namely, that it is because of their correspondence with the affections, and at the same time with articulations that are expressions containing things, and flowing from them.

[2] That harps especially signify the affections of truth because they excite such affections, consequently that they also signify confession made from spiritual truths with a cheerful heart, can be seen from the following passages. In Isaiah:

The new wine shall mourn, the vine shall languish, all the glad of heart shall sigh. The joy of timbrels shall cease, the noise of the merry shall leave off; the joy of the harp shall cease. They shall not drink wine with a song (Isaiah 24:7-9).

This treats of the vastation of the spiritual church, that is, of the good and truth thereof. Spiritual good, which is about to cease, is signified by "the new wine shall mourn," and "the joy of timbrels shall cease;" and that its truth is about to cease is signified by "the vine shall languish," and "the joy of the harp shall cease;" for "new wine" signifies spiritual good, and its joy is signified by the "timbrel;" and the "vine" signifies spiritual truth, and its joy is signified by the "harp." Since it is the affection of these that is about to cease, it is said, "all the glad of heart shall sigh," and "the noise of the merry shall leave off;" "gladness" and "mirth" in the Word signifying spiritual gladness and mirth, all of which are from the affections of truth and good. It is added, "they shall not drink wine with a song," because "song" signifies the testification of gladness from the affection of truth, and "wine" signifies truth.

[3] In David:

Confess unto Jehovah with the harp; sing psalms unto Him with the psaltery of ten strings. Sing unto Him a new song; play well with a loud noise. For the word of Jehovah is right; and His work is done in truth (Psalms 33:2-4).

As a "harp" signifies confession from spiritual truths, it is said, "confess unto Jehovah with the harp;" "a psaltery of ten strings" signifies the corresponding spiritual good; therefore it is said, "sing psalms unto Him upon a psaltery of ten strings;" and for the same reason also it is said, "for the word of Jehovah is right, and all His work is done in truth;" "the word of Jehovah is right" signifying the truth of good; "His work is done in truth" signifying the good of truth; the truth of good is the truth that proceeds from good, and the good of truth is the good which is produced by truth.

[4] In the same:

Send Thy light and Thy truth, let them lead me; let them bring me unto the mountain of holiness, and to Thy tabernacles, that I may confess unto Thee upon the harp, O God, my God (Psalms 43:3-4);

the "harp" evidently signifying confession from spiritual truths, for it is said "I will confess unto Thee with the harp, O God, my God;" and it is also said before, "send Thy light and Thy truth; let them lead me."

[5] In the same:

I will confess unto Thee with the instrument of psaltery, even Thy truth, O my God; unto Thee will I sing with the harp, O Holy One of Israel (Psalms 71:22).

As the "psaltery" signifies spiritual good, that is, the good of truth, and the "harp" spiritual truth, that is, the truth of good, and confession is made from each, it is said, "I will confess unto Thee with the instrument of psaltery; unto Thee will I sing with the harp."

[6] In the same:

I will sing, and I will sing psalms. Arouse me, ¹ my glory, arouse me, psaltery and harp. I will confess unto Thee, O Lord, among the nations, I will sing psalms unto Thee among the peoples (Psalms 57:7-9; 108:1-3).

Confession and glorification from the good of truth or from spiritual good, and from truth of good or from spiritual truth, are expressed in these several things, the good of truth by "singing," "being aroused by the psaltery," and "confessing among the nations;" and the truth of good by "singing psalms," "being aroused by the harp," and "singing psalms among the peoples;" for "nations" in the Word mean those who are in good, and "peoples" those who are in truth; here those in spiritual truth. It is so said because where good is spoken of, in the Word, truth also is spoken of, and this because of the marriage of these in every particular of the Word (See above, n. 238 end, 288).

[7] In the same:

Answer unto Jehovah by confession; sing psalms with the harp unto our God (Psalms 147:7).

Here also confession from spiritual good and from spiritual truth is expressed by "answer unto Jehovah by confession," and "sing psalms with the harp unto our God;" from spiritual good by "answer unto Jehovah;" and from spiritual truth by "sing psalms with the harp unto God;" "Jehovah" being used where good is treated of, and "God" where truth is treated of (See Arcana Coelestia n. 709, 732, 2586, 2769, 2807, 2822, 3921, 4287, 4402, 7010, 9167).

[8] In Ezekiel:

I will cause the noise of the songs to cease; and the voice of thy harps shall be no more heard; I will give thee to the parchedness of the cliff (Ezekiel 26:13-14).

This is said of Tyre, which signifies the church in respect to the knowledges of good and truth. Its vastation is described by these words; the vastation in respect to the knowledges of good by "I will cause the noise of thy songs to cease;" and the vastation in respect to the knowledges of truth by "the voice of harps shall be no more heard;" desolation of all truth by "I will give thee to the parchedness of the cliff;" "cliff" signifying truth, and its "parchedness" desolation.

[9] In David:

Make a loud noise unto Jehovah, all the earth; break forth, shout for joy, and sing psalms. Sing psalms unto Jehovah with the harp; with the harp, and the voice of a psalm. With trumpets and the sound of a cornet, make a loud noise before the King, Jehovah (Psalms 98:4-6).

The various kinds of affections from which the Lord is confessed and glorified are here expressed by various kinds of sounds and instruments; the various kinds of sounds in "making a loud noise," "breaking forth," "shouting for joy," and "singing psalms," and the various kinds of instruments, by "harps," "trumpets," and "cornets;" but to explain the signification of the particulars is not in place here, but only what relates to the harp. "To sing unto Jehovah with the harp, with the harp and the voice of a psalm," signifies confession from the affection of spiritual good and truth; for every affection, since it is from love, when it falls into sound, produces a sound in accord with itself; consequently from the sound that is in the speech, and in which, as it were, the expressions of speech flow, the affection of the other is heard, and thus becomes known to his companion; this is manifestly so in the spiritual world, where all sounds of speech make manifest the affections.

[10] So elsewhere in David, as the following:

Shout for joy unto God our strength; make a joyful noise to the God of Jacob. Lift up the psalm and strike the timbrel, the pleasant harp, with the psaltery. Blow the cornet at the new moon (Psalms 81:1-3).

It is good to confess unto Jehovah, and to sing psalms unto Thy name, O Most High; with an instrument of ten strings, and with the psaltery; and with resounding music on the harp (Psalms 92:1-3).

Let the sons of Zion exult in their King; let them praise His name in the dance; let them sing psalms unto Him with the timbrel and harp (Psalms 149:2-3).

Praise God with the sound of the cornet; praise Him with the psaltery and harp; praise Him with the timbrel and dance; praise Him with stringed instruments and organ. Praise Him with cymbals of soft sound; praise Him with cymbals of loud sound (Psalms 150:3-5).

[11] Because musical instruments and also dances signify varieties of joy and gladness that spring from the affections, as well as the affections themselves of the mind which their sounds excite, both singly and in combination, therefore:

David and the whole house of Israel played before Jehovah upon wooden instruments of every kind, and upon harps, and with psalteries, and with timbrels; and on sistra, and on cymbals (2 Samuel 6:5).

[12] Because the "harp" signifies confession from spiritual truths, and spiritual truths are those by which angels who are in the Lord's spiritual kingdom are affected, and which disperse the falsities of evil, and with these the spirits themselves who are in them, so:

When the evil spirit was upon Saul, David took a harp and played with his hand; and so rest was given to Saul, and the evil spirit departed from him (1 Samuel 16:23).

This was done because kings represented the Lord in respect to the spiritual kingdom, and therefore signified spiritual truths (See above, n. 31); but Saul then represented the falsities that are opposed to these truths; and these were dispersed by the sound of the harp, because the "harp" signified the spiritual affection of truth. This then took place because with the sons of Israel all things were representative and thus significative; it is otherwise at this day. From the passages here quoted it can be seen what the "harp" signifies, also in other places (as Isaiah 30:31, 32; Psalms 49:3, 4; 137:1, 2; 1 Samuel 10:5; Revelation 14:2; 18:22; Job 30:31).

[13] As most things in the Word have also a contrary meaning, so do musical instruments, in which sense they signify varieties of gladness and joy that spring from the affections of falsity and evil; thus the "harp" signifies the confession of falsity and the consequent exultation over the destruction of truth. As in Isaiah:

At the end of seventy years the song of Tyre shall be even as the song of a harlot; take a harp, walk in the city, thou harlot delivered over to forgetfulness; play elegantly, multiply the song (Isaiah 23:15-16).

"Tyre" signifies the church in respect to the knowledges of spiritual truth and good (as was said above), here the church in which these are falsified; "harlot" signifies the falsification of truth (See above, n. 141); and "to take a harp, walk in the city," "play elegantly, and multiply the song," signifies the exultation and boasting of falsity over the destruction of truth.

[14] In the same:

Woe to them that rise early in the morning that they may follow strong drink; to them that tarry until twilight till the wine inflame them. And the harp and the psaltery and the timbrel and the pipe and wine are at their feasts; but they do not look upon the work of Jehovah, and they see not the working of His hands (Isaiah 5:11-12).

Here "harp," "psaltery," "timbrel," "pipe," and also "wine," have the contrary meaning, in which they signify exultation and boastings from the falsities of evil. Such is evidently the meaning, for it is said, "Woe to them; they do not look upon the work of Jehovah, and they see not the working of His hands."

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