Gregory of Neocaesarea

For this present time is filled with all things that are most contrary to each other— births and deaths, the growth of plants and their uprooting, cures and killings, the building up and the pulling down of houses, weeping and laughing, mourning and dancing. At this moment a man gathers of earth's products, and at another casts them away; and at one time he ardently desires the beauty of woman, and at another he hates it. …

A Metaphrase of the Book of Ecclesiastes ↗

Jerome

"Everything has its season, and there is a time for everything under the heavens. "He has taught in the previous verses the doubtful and changeable state of humanity; now he wants to show that all things are opposed to each other in the world, and that nothing remains forever of those things, which are under the heavens and beyond time, since the other spiritual substances are contained neither in the heavens nor in time.

Commentary on Ecclesiastes ↗

Bonaventure

All things have their time, etc. Above he treated the vanity of things, showing that there is variability in them by reason of motion: here secondly he wishes to show vanity with respect to the determination and variety in time. And because he shows the mutability and variety of things not for contempt of them insofar as they are works of God, but insofar as they are loved by us: therefore in this part he shows first the variety of times: second he reproves our curiosity, there: What more has man: third he shows the perpetuity of the …

Commentary on Ecclesiastes, Chapter 3 ↗