In the morning it flourisheth - This does not mean that it grows with any special vigor or rapidity in the morning, as if that were illustrative of the rapid growth of the young; but merely that, in fact, in the morning it is green and vigorous, and is cut down in the short course of a day, or before evening. The reference here is to grass as an emblem of man.
And groweth up - The same word in the Hebrew which is used in the close of the previous verse.
In the evening it is cut down, and withereth - In the short period of a day. What was so green and flourishing in the morning, is, at the close of the day, dried up. Life has been arrested, and death, with its consequences, has ensued. So with man. How often is this literally true, that those who are strong, healthy, vigorous, hopeful, in the morning, are at night pale, cold, and speechless in death! How striking is this as an emblem of man in general: so soon cut down; so soon numbered with the dead. Compare the notes at Isaiah 40:6-8; notes at 1 Peter 1:24-25.