Indeed, it was for this that intelligent beings came into existence; namely, that the riches of the Divine blessings should not lie idle. The All-cre… - Gregory of Nyssa

When we have torn off the coatings of this life’s perishable leaves, we must stand again in the sight of our Creator; and repelling all the illusion of taste and sight, take for our guide God’s commandment only, instead of the venom-spitting serpent. That commandment was, to touch nothing but what was Good, and to leave what was evil untasted; because impatience to remain any longer in ignorance of evil would be but the beginning of the long train of actual evil. For this reason it was forbidden to our first parents to grasp the knowledge of the opposite to the good, as well as that of the good itself; they were to keep themselves from “the knowledge of good and evil,” and to enjoy the Good in its purity, unmixed with one particle of evil.

Evil will come to nought and will be completely destroyed. The divine, pure goodness will contain in itself every nature endowed with reason; nothing made by God is excluded from his kingdom once everything mixed with some elements of base material has been consumed by refinement in fire.

Is it not want of reason in any one to suppose that when he has striven successfully to escape the dominion of one particular passion, he will find virtue in its opposite?