Also he hath set the world in their heart— He hath even set that eternity in their hearts, without which no man can find out the design of that work which God hath done from beginning to end. The word עלם olam, rendered time in our version, but here eternity, Mr. Desvoeux has fully proved to signify properly an indefinite duration. See page 553. Solomon's first observation is, that God, who set men upon that ungrateful task, purposely that they might find him out, has done nothing but what is fit, though the fitness does not always presently appear. Hence it is that men, who, from the notion of an infinitely perfect Being, are convinced it must be so, even when they are not able to make it out plainly to themselves, entertain a sort of longing for eternity: for they are sensible, that the short space of life is not sufficient for them to find out the ways of their Maker, and cannot but perceive, at least confusedly, that such a life as this does not fully answer the wise designs of the supreme Governor of the world. See Peters on Job, p. 418, &c.
Related Commentaries of Ecclesiastes 3:11
Ecclesiastes 3:11
11 He hath made every thing beautiful in his time: also he hath set the world in their heart, so that no man can find out the work that God maketh from the beginning to the end.