Matteo 5:48

A summary of this section: Be ye therefore perfect, even as your Father which is in heaven is perfect.

Since all these arguments must be accepted, and since love is the fulfillment of the Law, the Lord draws His conclusion. Ye who wish to be counted as My disciples shall stand out in contrast with those whose idea of altruism is modeled after conventional standards. Nothing short of the great ideal shall satisfy you. With a single-mindedness of purpose that forgets all else they shall strive after perfection in accordance with their great model, their Father in heaven.

God is perfect, the fullness, the consummation, of all good. And the perfection of the Christians consists in striving after those ideals which God has set before them in His holy will. Thus they are daily and continually renewed in knowledge, and in holiness and righteousness, after the image of Him that made and redeemed them, until the day of their final perfection will dawn in heaven.

Summary. Christ opens the Sermon on the Mount with the beatitudes, gives a short outline of the call of the disciples in the world, shows the spiritual understanding of the Law by a number of examples, and teaches love toward one's enemy and true altruism.