Context & Key Themes
Psalm 90 is the oldest psalm in the Psalter and the only one attributed to Moses. It was likely written during the long wilderness wandering, after the judgment that a generation would not enter the promised land but die in the desert. Moses had watched his people fail and watched God’s discipline fall, and he writes from within that long dying — not with bitterness, but with extraordinary wisdom about the nature of time, human mortality, and the God who stands outside both. The contrast he draws is absolute: God is from everlasting to everlasting; man is like grass that springs up in the morning and withers by evening. Out of that contrast comes one of the most searching prayers in all of scripture: teach us to number our days, that we may gain a heart of wisdom.
Key Verse
“So teach us to number our days that we may get a heart of wisdom. Return, O Lord! How long? Have pity on your servants! Satisfy us in the morning with your steadfast love, that we may rejoice and be glad all our days.”
— Psalm 90:12–14
Summary
Moses opens by addressing God as the dwelling place of his people across all generations — before mountains were born, before the earth was formed, from everlasting to everlasting, God is God. In his sight a thousand years are like a day, like a watch in the night. He sweeps men away like a flood; they are like a dream, like grass that flourishes in the morning and fades by evening. God’s anger consumes them for their iniquities; their secret sins are in the light of his presence.
All the days of Israel’s life pass under God’s wrath; they bring their years to an end like a sigh. The years of a life are seventy, or perhaps eighty for the strong, and even those are toil and trouble. They pass swiftly, and they fly away. Who understands the power of God’s anger? Who knows the fear he deserves? So teach us to number our days. Return, O Lord — how long? Be sorry for your servants. Satisfy us each morning with your steadfast love. Gladden us for as many days as you have afflicted us. Let your work be seen by your servants. Let your favor rest upon us, and establish the work of our hands.
Reflection
Psalm 90 does not romanticize mortality. It describes it with unflinching clarity: human life is brief, fragile, subject to decay, conducted entirely within the frame of God’s eternity and under the shadow of his judgment on sin. Moses has seen enough to know that all the pretensions of permanence that people build are grass. What he asks for in response is not longer life but wiser life — a heart that has actually reckoned with its own brevity and chosen, on the basis of that reckoning, to live toward the things that endure.
The prayer for morning satisfaction with God’s steadfast love is the pivot of the whole psalm. Not the elimination of suffering or the restoration of comfort — but the experience of God’s love as sufficient, day by day, morning by morning. And the final request — establish the work of our hands — is a prayer that the brief, perishable things human beings do in their brief and perishable lives might somehow matter, might be taken up into what God is building, might outlast the grass. That is the most honest ambition available to a creature who has numbered his days.