As for man - literally, “Man; like the grass are his days!” The thought is fixed on man: man so frail and weak; man, not only made originally of earth, but man delicate, feeble, soon to pass away like the springing grass, or like the fading flower.
His days are as grass - See the notes at Psalms 90:5-6; compare Isaiah 40:6-8, notes; 1 Peter 1:24, note.
As a flower of the field - As a blossom. It opens with beauty and fragrance, but soon fades and perishes.
So he flourisheth - Rather, “So he blossoms.” That is, he is like a flower that is fresh and beautiful, and that soon withers away.