God's name is not known; it is wondered at. - Gregory of Nyssa

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-creating Wisdom fashioned these souls, these receptacles with free wills, as vessels as it were, for this very purpose, that there should be some capacities able to receive His blessings and become continually larger with the inpouring of the stream.

The good and eatable fish are separated by the fishers' skill from the bad and poisonous fish, so that the enjoyment of the good should not be spoilt by any of the bad getting into the "vessels" with them. The work of true sobriety is the same; from all pursuits and habits to choose that which is pure and improving, rejecting in every case that which does not seem likely to be useful, and letting it go back into the universal and secular life, called "the sea" (Matthew 13:47-48), in the imagery of the Parable.

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.