Jamieson, Fausset and Brown on Ecclesiastes 3:14

14. (1Sa 3:12; 2Sa 23:5; Psa 89:34; Mt 24:35; Jas 1:17).

for ever--as opposed to man's perishing labors (Ec 2:15-18).

any thing taken from it--opposed to man's "crooked and wanting" works (Ec 1:15; 7:13). The event of man's labors depends wholly on God's immutable purpose. Man's part, therefore, is to do and enjoy every earthly thing in its proper season (Ec 3:12, 13), not setting aside God's order, but observing deep reverence towards God; for the mysteriousness and unchangeableness of God's purposes are designed to lead "man to fear before Him." Man knows not the event of each act: otherwise he would think himself independent of God.