More insight from Father Georges Florovsky

In the Gospel of St. Matthew (5:16) it is our Lord who uses the terminology of "good works." " Let your light so shine before men, that they may see your good works and may glorify your Father who is in heaven" Contextually these "good works" are defined in the preceding text of the Beatitudes. "Blessed are the meek, for they shall inherit the earth." "Blessed are they who are hungering and are thirsting for righteousness, for they shall be satisfied." "Blessed are the pure in heart, for they shall see God." Is it not an integral part of the monastic goal to become meek, to hunger and thirst for righteousness, and to become pure in heart? This, of course, must be the goal of all Christians but monasticism, which makes it an integral part of its ascetical life, can in no way be excluded. Are not the Beatitudes more than just rhetorical expressions? Are not the Beatitudes a part of the commandments of our Lord? In the Gospel of St. Matthew (5:19) our Lord expresses a deeply meaningful thought—rather a warning. "Whoever therefore breaks one of the least of these commandments and teaches men so, he shall be called the least in the kingdom of heaven. And it is in this context that our Lord continues to deepen the meaning of the old law with a new, spiritual significance, a penetrating interiorization of the "law." He does not nullify or abrogate the law but rather extends it to its most logical and ontological limit, for he drives the spiritual meaning of the law into the very depth of the inner existence of mankind.

"You heard that it was said to those of old ... but I say to you." Now, with the deepening of the spiritual dimension of the law, the old remains, it is the base, but its spiritual reality is pointed to its source. "You shall not kill" becomes inextricably connected to "anger." "But I say to you that everyone being angry with his brother shall be liable to the judgment." No longer is the external act the only focal point. Rather the source, the intent, the motive is now to be considered as the soil from which the external act springs forth. Mankind must now guard, protect, control, and purify the inner emotion or attitude of "anger" and, in so doing, consider it in the same light as the external act of killing or murder. Our Lord has reached into the innermost depth of the human heart and has targeted the source of the external act. "You shall not commit adultery. But I say to you that everyone who is seeing a woman lustfully, has already committed adultery with her in his heart. From a spiritual perspective the person who does not act externally but lusts within is equally liable to the reality of "adultery." "You have heard that it was said, ‘You shall love your neighbor and you shall hate your enemy’. But I say to you: Love your enemies and pray for those persecuting you so that you may become sons of your Father in heaven."

- from THE ASCETIC IDEAL AND THE NEW TESTAMENT: Reflections on the Critique of the Theology of the Reformation