We shall be blessed with clear vision if we keep our eyes fixed on Christ, for he, as Paul teaches, is our head, and there is in him no shadow of evi… - Gregory of Nyssa

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.

The climbing soul, leaving all that she has grasped already as too narrow for her needs, will thus grasp the idea of that magnificence which is exalted far above the heavens. But how can any one reach to this, whose ambitions creep below? ... He therefore who keeps away from all bitterness and all the noisome effluvia of the flesh, and raises himself on the aforesaid wings above all low earthly ambitions, or, more than that, above the whole universe itself, will be the man to find that which is alone worth loving, and to become himself as beautiful as the Beauty which he has touched and entered.

The man of half-grown intelligence, when he observes an object which is bathed in the glow of a seeming beauty, thinks that that object is in its essence beautiful, no matter what it is that so prepossesses him with the pleasure of the eye. He will not go deeper into the subject. But the other, whose mind's eye is clear, and who can inspect such appearances, will neglect those elements which are the material only upon which the Form of Beauty works; to him they will be but the ladder by which he climbs to the prospect of that Intellectual Beauty, in accordance with their share in which all other beauties get their existence and their name.