Adam Clarke on Ecclesiastes 3:9

What profit hath he - What real good, what solid pleasure, is derived from all the labors of man? Necessity drives him to the principal part of his cares and toils; he labors that he may eat and drink; and he eats and drinks that he may be preserved alive, and kept from sickness and pain. Love of money, the basest of all passions, and restless ambition, drive men to many labors and expedients, which perplex and often destroy them. He, then, who lives without God, travails in pain all his days.