C. F. Keil and Franz Delitzsch on Ecclesiastes 1:14

Ecc 1:14

He adduces proof of the wearisomeness of this work of research: “I saw all the works that are done under the sun; and, behold, all is vanity and striving after the wind.” The point of the sentence lies in והנּה = וארא וה, so that thus raïthi is the expression of the parallel fact (circumst. perfect). The result of his seeing, and that, as he has said Ecc 1:13, of a by no means superficial and limited seeing, was a discovery of the fleeting, unsubstantial, fruitless nature of all human actions and endeavours. They had, as hevel expresses, not reality in them; and also, as denoted by reuth ruahh (the lxx render well by προαίρεσις πνεύματος), they had no actual consequences, no real issue. Hos 12:1 also says: “Ephraim feedeth on wind,” i.e., follows after, as the result of effort obtains, the wind, roěh ruahh; but only in the Book of Koheleth is this sentence transformed into an abstract terminus technicus (vid., under Reth).