Click here for the complete ->Trinity 8, Third Sermon
1. Christ our Lord preached this part of the Gospel in concluding his long sermon on the mount, When he had taught his disciples all they should know, he proceeds and warns them to be ever on their guard against false doctrine; as all good ministers try and should do at the close of their sermons, namely, warn the people to hold fast to the true doctrine and beware of false teaching.
Thus St. Paul also did, Acts 20:28-31, when he was about to depart from Ephesus, among other things, he said: “Take heed unto yourselves, and to all the flock, in which the Holy Spirit hath made you bishops, to feed the church of the Lord which he purchased with his own blood. I know that after my departing grievous wolves shall enter in among you, not sparing the flock; and from among your own selves shall men arise, speaking perverse things, to draw away the disciples after them. Wherefore watch ye, remembering that by the space of three years I ceased not to admonish every one night and day with tears.”
Thus here and there in all his Epistles Paul always adds an admonition, to guard themselves against other teachings. Just as St. Peter also gives an admonition in his second Epistle, 2 Peter 2:1f, when he says: “But there arose false prophets also among the people, as among you also there shall be false teachers, who shall privily bring in destructive heresies, denying even the Master that bought them, bringing upon themselves swift destruction. And many shall follow their lascivious doings; by reason of whom the way of the truth shall be evil spoken of. And in coveteousness shall they with feigned words make merchandise of you; whose sentence now from of old lingereth not, and their destruction slumbereth not.”
2. Christ here proceeds in like manner. When he finished his sermon he warns his disciples and the people and admonishes them ever to remain faithful to what he had told them, and to be very careful not to be misled by false teachers, and says: “Beware of false prophets.”
3. First from this we are to understand that we are under obligation to reflect upon this fact and that it will always be that after the true preachers depart false teachers will come; yea, they will even enter along with and mingle with them. Otherwise, why were it necessary for Christ so faithfully to admonish us when he says: “Beware,” take care! if he had known that all his teachings would continue pure? Therefore he gives us this warning, that we may be certain of false prophets appearing after the true and pure doctrine is preached. For it has come to pass in all periods of the world’s history that after faithful and true ministers, prophets and rulers of God’s people labored, others followed who corrupted the pure doctrine, faith and worship; as the Book of Judges 2:10f, also describes. When those were gathered to their fathers whom God had given the people as teachers and judges, who knew the will of God, what was and what was not acceptable to him, immediately the people of Israel began to turn away from God and his Word. One worshiped this idol, another that, and they were divided into factions so that they fell from the true teachings and strayed from the ways of their fathers.
4. So it was also in the times of the Apostles. Then the doctrine was yet pure; but when they died who held to their true teachings, false apostles and factious leaders came, who perverted everything and desired radical changes in all things, as the Epistles of St. Paul sufficiently show. Now, inasmuch as this is so, and we cannot expect anything else, Christ our Lord warns us here in the spirit of a true shepherd and bishop, that we beware while we have the Gospel preached in its purity and simplicity, that we hold firmly to it and depart not from it, even at the risk of losing our life and possessions. For it cannot be otherwise than that God’s Word will not continue always pure and unadulterated in all generations.
5. Thus it will come to pass also among us.