Psalm 90 speaks of time, permanence and impermanence, and the span of human life. It upholds the eternal nature of the Lord: "Even from everlasting to everlasting, You are God."

A secondary but connected theme, especially from verses 7-12, is the Lord's apparent anger with us, and his affliction of our lives with troubles. The reason given for this is that we can then learn the true nature of our lives and of our dependence on Him.

The psalm ends with a prayer for the Lord's compassion on us, and for us to be glad all our days, according to the days of our affliction. We wish to know the work of the Lord. We hope that the work of our hands - our purpose and use - will be established.

This is a relatively profound psalm, covering many questions we have about life. It links our sense of our own frailty with the Lord's greater purposes. In the same way that 'time' is basically only an appearance to us, so our unthinking view of life is generally illusory. It can bring us to think of God as angry, and against us. But, nothing could be further from the truth. (See Heaven and Hell 165)

It's important to see that the first two verses are unambiguously true: First, "Lord, You have been our dwelling place in all generations", and second, "even from everlasting to everlasting, You are God". Spiritually, for us, holding this opening statement in our minds allows us to explore our whole relationship with the Lord. (See Arcana Caelestia 3913)

The next four verses bring out the frailty of our existence, that in a sense we are made from the dust of the earth. Spiritually, this is not said to condemn us, but to remind us that without the Lord, we are nothing. (See Arcana Caelestia 8995)

This humility allows us to come into spiritually positive territory. This is brought out in the context of time being as nothing - "a thousand years in God's sight are like yesterday" - they are carried away and temporary. (See Divine Providence 218-219)

From verse 7 onward come descriptions of the Lord's anger and wrath, along with the brevity and futility of our days in life. "We finish our years like a sigh." All of this is said in the language of appearance - of how it can seem to us - when we consider life only from our viewpoint and not from the Lord's purpose in it. (See Arcana Caelestia 1093 and Sacred Scripture 94.) In reality, the Lord does not ever have or hold anger and wrath.

Verse 12 provides a helpful clue to the verses which come before it. It is a prayer from us to the Lord to teach us to number our days, that we may gain a heart of wisdom. This is a lesson learned from our experience in life, with its pitfalls and its speedy passing, when we realise our folly too late.

The last five verses are clearer and brighter, asking the Lord to gladden us in our lives, and for us to see the work of God in all that we go through, and finally for the Lord our God to establish the work of our hands. Note that this positive ending comes from having endured confusion and negative states which we have now worked through, and that they have gone from us. (See Apocalypse Explained 897.)

897. Verse 13. And I heard a voice from heaven saying to me, signifies consolation by the Lord after temptations. This is evident from the signification of "a voice saying" as being what follows, which are consolations after temptations (See below); also from the signification of "saying from heaven," as being from the Lord; for what is declared from heaven is Divine truth; and while this is spoken by angels from heaven, yet it is spoken by the Lord through angels. For angels, like men, cannot think any truth from themselves nor do good from themselves, but only from the Lord; and this is why "angels" signify in the Word Divine truths from the Lord, and "heaven" signifies the Lord. Those are greatly mistaken who believe that angels were created immediately, and in such a state of integrity that they could do good from themselves; for all angels throughout the entire heaven have been men, and therefore they have what is their own [proprium], the same as men have, and this is wholly evil. But while they lived in the world as men they were regenerated by the Lord, and thus could be withheld from evils and their falsities and be held in goods; and when they are withheld from evils and held in goods by the Lord it seems as if they are in goods from themselves, and yet they know and perceive that this they have from the Lord and not from themselves. From all this it can be seen why the whole angelic heaven, as to intelligence and wisdom and as to the affections of good and truth, is the Lord. And this is why "a voice saying from heaven" signifies such things as are from the Lord, and here consolations after temptations, and this because the preceding verse treats of the patience of those "who keep the commandments of God and the faith of Jesus," and "patience" here signifies temptations.

[2] Something shall now be said about consolations after temptations. All who are being regenerated by the Lord undergo temptations, and after temptations experience joys. But the source of the temptations and of the joys that follow, which are here meant by consolations, is not yet known in the world, because there are few who experience spiritual temptations, for the reason that there are few who are in the knowledges of good and truth, and fewer yet who are in the marriage of good and truth, that is, in truths as to doctrine and at the same time in goods as to life; and no others are let into spiritual temptations; for if others were let into temptations they would yield, and if they yielded their latter state would be worse than their former state. The true reason why only those who are in the marriage of good and truth can be let into spiritual temptations is that the spiritual mind, which is, properly, the internal man, can be opened only with these; for when that mind is opened temptations exist, and for the reason that heaven, that is the Lord through heaven, flows in through man's spiritual mind into his natural mind; there is no other way of heaven, that is of the Lord through heaven, into man; and when heaven flows in it removes the hindrances, which are evils and falsities therefrom, which have their seat in the natural mind, that is, in the natural man; and these can be removed only by a living acknowledgment of them by man, and grief of soul on account of them. This is why man is distressed in temptations by the evils and falsities that rise up into the thought; and so far as he then acknowledges his sins, regards himself as guilty, and prays for deliverance, so far the temptations are useful to him. From this it is clear that man has spiritual temptation, when his internal, which is called the spiritual mind, is opened, thus when man is being regenerated. When, therefore, man's evils and falsities are removed temptations are brought to an end; and when they are ended joy flows in through heaven from the Lord and fills his natural mind. This joy is what is here meant by consolations. These consolations all those receive who undergo spiritual temptations. I speak from experience. After temptations man receives joys because after them man is admitted into heaven; for through temptations man is conjoined to heaven and is admitted into it, and consequently has joy like that of the angels there.