Managing What Belongs to God:Time

As for the days of our life, they contain seventy years,
Or if due to strength, eighty years,
Yet their pride is but labor and sorrow;
For soon it is gone and we fly away.
11 Who understands the power of Your anger
And Your fury, according to the fear that is due You?
12 So teach us to number our days,
That we may present to You a heart of wisdom.

PSalm 90:10-12 NASB