For what hath the wise more than the fool? - They must both labor for the same end. Both depend upon the labor of themselves or others for the necessaries of life. Both must eat and drink in order to live; and the rich man can no more eat two meals at a time, than he can comfortably wear two changes of raiment. The necessaries of life are the same to both, and their condition in life is nearly similar; liable to the same diseases, dissolution, and death.
Connect these verses with Ecclesiastes 6:2-3: “All labor is undertaken with a view to some profit, but as a rule the people who labor are never satisfied. What advantage then has he who labors if (being rich) he is wise, or if being poor he knows how to conduct himself properly; what advantage have such laborers above a fool? (None, so far as they are without contentment, for) a thing present before the eyes is preferable to a future which exists only in the desire.”
Ecclesiastes 6:8
What - literally, what profit (as in Ecclesiastes 1:3).
Knoweth living - i. e., “Knows how to conduct himself rightly among his contemporaries.”