He has made everything beautiful in its time. Also, he has put eternity into man’s heart, yet so that he cannot find out what God has done from the beginning to the end.
We have seen what changes there are in the world, and must not expect to find the world more sure to us than it has been to others. Now here Solomon shows the hand of God in all those changes; it is he that has made every creature to be that to us which it is, and therefore we must have our eye always upon him. I.
Commenting on Ecclesiastes 3:11-15
He hath made every thing beautiful in his time,.... That is, God has made everything; as all things in creation are made by him, for his pleasure and glory, and all well and wisely, there is a beauty in them all: so all things in providence; he upholds all things; he governs and orders all things according to the counsel of his will; some things...
his time--that is, in its proper season (Psa 1:3), opposed to worldlings putting earthly pursuits out of their proper time and place (see on Ecc 3:9). set the world in their heart--given them capacities to understand the world of nature as reflecting God's wisdom in its beautiful order and times (Rom 1:19-20). "Everything" answers to "world," in the parallelism.