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.)

1093. That 'cursed be Canaan' means that external worship separated from internal turned itself away from the Lord is clear from the meaning of 'Canaan' and from the meaning of 'being cursed'. That 'Canaan' is external worship separated from internal is clear from what has been stated already about Canaan, also from his being called 'cursed'; and from what follows about his being 'a slave of slaves'. And being a slave both to Shem and to Japheth cannot mean anything other than something separated from the Church itself, such as worship that is wholly external. This is clear from the meaning of 'being cursed' as turning oneself away, for the Lord in no way curses anybody, or is even angry. Instead it is man who brings the curse upon himself by turning himself away from the Lord. On these points see what has been shown already in 223, 245, 592. The Lord is as far from cursing or being angry with anyone as the sky is from the earth. Who can believe that the Lord, who is all-knowing and all-powerful, who with wisdom rules the universe, and so who is infinitely superior to all [human] weaknesses, is angry with such pitifully worthless dust, that is, with human beings who scarcely know anything of what they do and who of themselves are incapable of anything other than evil? With the Lord therefore anger is never present, only mercy.

[2] That arcana are contained here can be seen merely from the consideration that even though it was Ham who saw his father's nakedness and pointed it out to his brothers, he was not cursed but his son Canaan, who was not his only son nor even the firstborn but the fourth in line, as is clear from Chapter 10, verse 6 later on, where the sons of Ham are mentioned as being Cush, Mizraim, Put, and Canaan. It can in addition be seen from the Divine Law that no son was to bear his father's iniquity, as is clear in Ezekiel,

The soul that has sinned will die. The son will not bear the iniquity of the father, nor will the father bear the iniquity of the son. Ezekiel 18:20; Deuteronomy 14:16; 2 Kings 14:6.

And the same can also be seen from the consideration that this iniquity of merely seeing his father's nakedness and pointing it out to his brothers seems too slight for all of his descendants ever to have been cursed on that account. From these considerations it is clear that arcana are contained here.

[3] The reason Ham is not mentioned here but Canaan is that Ham means faith separated from charity in the spiritual Church, which cannot be cursed because in that Church faith has holiness present within it because truth is present there. And although there is no faith when there is no charity, it is still possible - since it is by means of the cognitions of faith that a person is regenerated - for separated faith to be allied to charity, and in this way to be in some sense 'a brother' or may become one. This was why Canaan was cursed and not Ham. Furthermore the inhabitants of the land of Canaan were for the most part people such as made all worship consist in external things, the Jews there as much as the gentiles. These are the arcana contained here, but for which Canaan would never have been substituted for Ham. That external worship separated from internal turns itself away and so brings a curse on itself is quite clear from the fact that people whose worship is external have no regard for anything other than worldly, bodily, and earthly things. Thus they look downwards, and immerse their minds (animus) and life in those things; such will be dealt with a little further on.