SECTION III. A TRUE PREACHER SHOULD FIRST USE THE LAW ARIGHT AND THEN PREACH THE GOSPEL.

9. The porter here is the preacher who rightly teaches the Law—shows that the Law exists and must reveal to us our helplessness; that the works of the Law do not help us, and yet they are insistent. He then opens to the shepherd, that is, to Christ the Lord, and lets him alone feed the sheep. For the office of the Law is at an end; it has accomplished its mission of revealing to the heart its sins until it is completely humbled. Then Christ comes and makes a lamb out of the sheep—feeds it with his Gospel and directs it how to regain cheer for the heart so hopelessly troubled and crushed by the Law.

10. The lamb then hears Christ’s voice and follows it. It has the choicest of pastures, and knows the voice of the shepherd. But the voice of a stranger it never hears and never follows. Just as soon as one preaches to it about works, it is worried and its heart cannot receive the teaching with joy. It knows very well that nothing is accomplished by means of works; for one may do as much as he will, still he carries a heavy spirit and he thinks he has not done enough, nor done rightly. But when the Gospel comes—the voice of the shepherd—it says: God gave to the world his only Son, that all who believe on him should not perish, but have everlasting 378 life. Then is the heart happy; it feeds upon these words and finds them good. The lamb has found its satisfying pasture; it wants none other. Yea, when it is given other pasture, it flees from it and will not feed therein. This pasture always attracts the sheep, and the sheep also find it. God says in the prophecy of Isaiah: “So shall my Word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish all in the things whereto, I sent it” (Is 55:11).