because sometimes a person who has toiled with wisdom and knowledge and skill must leave everything to be enjoyed by someone who did not toil for it. This also is vanity and a great evil.
Business is a thing that wise men have pleasure in. They are in their element when they are in their business, and complain if they be out of business. They may sometimes be tired with their business, but they are not weary of it, nor willing to leave it off.
Commenting on Ecclesiastes 2:17-26
For there is a man whose labour is in wisdom, and in knowledge, and in equity,.... Who does all he does, in natural, civil, and religious things, in the state, in his family, and the world, and whatsoever business he is engaged, in the wisest and best manner, with the utmost honesty and integrity, according to all the rules of wisdom and knowledge, and of...
Suppose "there is a man," &c. equity--rather "with success," as the Hebrew is rendered (Ecc 11:6), "prosper," though Margin gives "right" [HOLDEN and MAURER]. evil--not in itself, for this is the ordinary course of things, but "evil," as regards the chief good, that one should have toiled so fruitlessly.