As I continued to work my way slowly through the book of Psalms, I came across a psalm written by Moses. Indeed, it is specifically Psalm 90.
Through much of Moses' life, you would have expected him to be very much familiar with the frailty of life. As miraculous as it was for him to be spared in the first place, can you imagine growing up knowing that several from your generation your kinsfolk were killed as babies? Can you imagine knowing that your people were slaves living a life of turmoil? Yes, Moses indeed understood the trauma of the world.
So it comes as no surprise when he makes reference to the brevity of life in Psalm 90:10-14,
"The days of our years are threescore years and ten; and if by reason of strength they be fourscore years, yet is their strength labour and sorrow; for it is soon cut off, and we fly away. Who knoweth the power of thine anger? even according to thy fear, so is thy wrath. So teach us to number our days, that we may apply our hearts unto wisdom. Return, O Lord, how long? and let it repent thee concerning thy servants. O satisfy us early with thy mercy; that we may rejoice and be glad all our days."
So teach us to number our days, that we may apply our hearts unto wisdom. Moses knew one thing from all of his experiences with the trials in the midst of his life - life is too short not to spend it wisely serving the Lord, not to spend it rejoicing in God's mercy.
I believe the challenge speaks for itself.