90 begins with the reminder of the eternity of God and His awesome
power. Compared to God man is extremely limited and the span of his
day approximately 70 to 80 years. Man is like the grass, here today
and gone tomorrow.
12 reminds us to number our days. This is a reminder to
think about our days and how we live. Be prepared for death or
the second coming. To not consider and think about our days and
how we live would be foolishness.
14-15 tells us of God's mercy. Oh that we would understand
His mercy so that our days will be days of gladness. We should
petition for God's mercy so that our days will be joyful, not full
16-17 is our request for for His favor so that the beauty of the
Lord our God be upon us