Man was made in the image and likeness of God; but sin marred the beauty of the image by dragging the soul down to passionate desires. Now, God, who made man, is the true life. Therefore, when man lost his likeness to God, he lost his participation in the true life; separated and estranged from God as he is, it is impossible for him to enjoy the blessedness of the divine life. Let us return, then, to the grace [which was ours] in the beginning and from which we have alienated ourselves by sin, and let us again adorn ourselves with the beauty of God’s image, being made like to our Creator through the quieting of our passions. He who, to the best of his ability, copies within himself the tranquillity of the divine nature attains to a likeness with the very soul of God; and being made like to God in the manner aforesaid, he also achieves in full a semblance to the divine life and abides continually in unending blessedness. If, then, by overcoming our passions we regain the image of God and if the likeness of God bestows upon us everlasting life, let us devote ourselves to this pursuit in preference to all others, so that our soul may never again be enslaved by vice, but that our understanding may remain firm and unconquerable under the assaults of temptation, that the end that we become sharers in the divine beatitude.
Saint Basil the Great, “An Ascetical Discourse,” in Saint Basil. Ascetical Works. Translated by Sister M. Monica Wagner, C.S.C. (New York: Fathers of the Church, Inc., 1950), 207.