Church Fathers on John 10:4

Our Lord having reproached the Jews with blindness, they might have said, We are not blind, but we avoid you as a deceiver. Our Lord therefore gives the marks which distinguish a robber and deceiver from a true shepherd. First come those of the deceiver and robber: Verily, verily, I say to you, He that enters not by the door into the sheepfold, but climbs up some other way, the same is a thief and a robber. There is an allusion here to Antichrist, and to certain false Christs…

Many go under the name of good men according to the standard of the world, and observe in some sort the commandments of the Law, who yet are not Christians. And these generally boast of themselves, as the Pharisees did; Are we blind also? But inasmuch as all that they do they do foolishly, without knowing to what end it tends, our Lord said of them, Verily, verily, I say to you, He that enters not by the door into the sheepfold, but climbs up some other way, the same is a…

Or, the Holy Spirit is the porter, by whom the Scriptures are unlocked, and reveal the truth to us.