I am paraphrasing here~
the actual verses are
As for man, his days are like grass;
he flourishes like a flower of the field;
for the wind passes over it, and it is gone,
and its place know it now more.
In the big picture....
our lives here on earth are so very short.
We are here for one main reason~
to prepare for our eternal existence
either in Heaven or in Hell
We receive our reward when we show our obedience to HIM
If I can keep this as my focus then my heart has peace.