Today's Psalm is Psalm 90, a Prayer of Moses.
Moses begins the Psalm with a declaration of God's eternal nature, noting that He is their dwelling place in all generations, and that He was God even before the creation of the world. He also notes the timeless nature of God in this verse quoted by Peter:
For a thousand years in Your sight
Are like yesterday when it is past,
And like a watch in the night.
He acknowledges their (Israel's) sin against God, and the terrifying nature of God's wrath, and asks God to teach them to number their days that they may gain a heart of wisdom.
Who knows the power of Your anger?
For as the fear of You, so is Your wrath.
So teach us to number our days,
That we may gain a heart of wisdom.
Moses continues his prayer with a plea for God's mercy, and to be satisfied with God's mercy, so that they may rejoice and be glad all their days. He closes with a plea for God's work to appear to His servants, and for Him to establish the work of their hands.
Oh, satisfy us early with Your mercy,
That we may rejoice and be glad all our days!
Make us glad according to the days in which You have afflicted us,
The years in which we have seen evil.
Let Your work appear to Your servants,
And Your glory to their children.
And let the beauty of the LORD our God be upon us,
And establish the work of our hands for us;
Yes, establish the work of our hands.
Scripture taken from the New King James Version. Copyright © 1982 by Thomas Nelson, Inc. Used by permission. All rights reserved.