Ecclesiastes 3:9

“What profit hath he that worketh in that wherein he laboureth?] That is, he has none. This is an inference drawn from the above premises, and confirms what has been before observed, (<210103>Ecclesiastes 1:3 2:11); Man has no profit of his labour, since his time is so short to enjoy it, and he leaves it to another, he knows not who; and, while he lives, is attended with continual vicissitudes and changes; sometimes it is a time for one thing, and sometimes for its contrary, so that there is nothing certain, and to be depended on; and a man can promise himself nothing in this world pleasant or profitable to him, and much less that will be of any advantage to him hereafter. The Targum adds,…”

“But these earthly pursuits, while lawful in their season, are "unprofitable" when made by man, what God never intended them to be, the chief good. Solomon had tried to create an artificial forced joy, at times when he ought rather to have been serious; the result, therefore, of his labor to be happy, out of God's order, was disappointment. "A time to plant" (Ecc 3:2) refers to his planting (Ecc 2:5); "laugh" (Ecc 3:4), to Ecc 2:1-2; "his mirth," "laughter"; "build up," "gather stones" (Ecc 3:3, Ecc 3:5), to his "building" (Ecc 2:4); "embrace," "love," to his "princess" (see on Ecc 2:8); "get" (perhaps also "gather," Ecc 3:5-6), to his "gathering" (Ecc 2:8). All these were of "no profit,"…”

“What profit - Seeing then all events are out of man's power, and no man can do or enjoy any thing at his pleasure, but only when God pleaseth, as has been shewed in many particulars, and is as true and certain in all others, hence it follows, that all men's labours, without God's blessing, are unprofitable, and utterly insufficient to make them happy. Ecclesiastes 3:10”

“3:9-14 Even though every activity has an appropriate occasion (3:1-8), only God can truly know what that occasion is (3:9-11). Mortals must be content with uncertainty and trust the sovereign God who gives enjoyment to those who work wisely and righteously. 3:9 get for . . . hard work? See 3:12-13.”

“Ecc 1:3, Ecc 2:11, Ecc 2:22, Ecc 2:23, Ecc 5:16; Pro 14:23; Mat 16:26 Ecclesiastes 3:10”

“Since, then, everything has its time depending not on human influence, but on the determination and providence of God, the question arises: "What gain hath he that worketh in that wherewith he wearieth himself?" It is the complaint of Ecc 1:3 which is here repeated. From all the labour there comes forth nothing which carries in it the security of its continuance; but in all he does man is conditioned by the change of times and circumstances and relations over which he has no control. And the converse of this his weakness is short-sightedness. Ecclesiastes 3:10”