Establish the work of our hands for us

Psalm 90:7-17
All our days pass away under your wrath; we finish our years with a moan. The length of our years is seventy years- or eighty, if we have the strength; yet their span is but trouble and sorrow, for they quickly pass, and we fly away.
Teach us to number our days aright, that we may gain a heart of wisdom.
Relent, O Lord! How long will it be? Have compassion on your servant.
May your deeds be show to your servants, your splendor to their children.
May the favor of the Lord our God rest upon us; establish the work of our hands for us- yes, establish the work of our hands.
Why?
Our span of life is short, yet even this must be worked out under God's judgement.
The psalmist appeals to God's pity as he begs for the return of joy and gladness.
Our each day is under the Lord, number our days aright: memory the mercy and the deeds of the Lord, then we may gain a heart of wisdom.