Gregory of Nyssa — on Eccl 1:14 (HOMILIES ON ECCLESIASTES 2)

“Ecclesiastes has come to search through his own wisdom those actions done under the sun, their confusion, why things are subject to nonexistence and how that which is insubstantial prevails against being. He knew that "God has given to the sons of men an evil trouble to be vexed with." This is not a pious deed we can readily understand because God has given an evil to the sons of men in order to trouble them; and so one may attribute the cause of evil to God.… A more pious understanding suggests that God bestows upon man the gift of free will which he abused and then became an instrument for sin. This free will is good and subject to no one, while anything subject to necessity should not be counted as good. But any impulse coming from the mind is free; it distracts the soul to choose evil and pulls it down to passion from the lofty honors it had received.… An accurate understanding of these verses does not mean that human nature lacks anything unbecoming from God; rather, they censure our power of free choice which in itself is good and a gift bestowed by God to human nature. But as a result of indiscretion, free will inclines towards the opposite way.”