Verily, verily, I say unto 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.
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John Chrysostom
AD 407
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 who had been, and were to be. The Scriptures He calls the door. They admit us to the knowledge of God, they protect the sheep, they shut out the wolves, they bar the entrance to heretics. He that uses not the Scriptures, but climbs up some other way, i.e. some self-chosen, some unlawful way, is a thief. Climbs up, He says, not, enters, as if it were a thief getting over a wall, and running all risks. Some other way, may refer too to the commandments and traditions of men which the Scribes taught, to the neglect of the Law. When our Lord further on calls Himself the Door, we need not be surprised. According to the office which He bears, He is in one place the Shepherd, in another the Sheep. In that He introduces us to the Father, He is the Door, in that He takes care of us, He is the Shepherd.
You have seen His description of a robber, now see that of the Shepherd: But he that enters in by the door is the shepherd of the sheep.
The porter perhaps is Moses; for to him the oracles of God were committed.
As they had called Him a deceiver, and appealed to their own unbelief as the proof of it; (Which of the rulers believes in Him?) He shows here that it was because they refused to hear Him, that they were put out of His flock. The sheep hear His voice. The Shepherd enters by the lawful door; and they who follow Him are His sheep; they who do not, voluntarily put themselves out of His flock.
He led out the sheep, when He sent them not out of the reach of, but into the midst of, the wolves. There seems to he a secret allusion to the blind man. He called him out of the midst of the Jews; and he heard His voice.
Shepherds always go behind their sheep; but He, on the contrary, goes before, to show that He would lead all to the truth.
The strangers areTheudas, and Judas, and the false apostles who came after Christ. That He might not appear one of this number, He gives many marks of difference between Him and them. First, Christ brought men to Him by teaching them out of the Scriptures; they drew men from; the Scriptures. Secondly, the obedience of the sheep; for men believed on Him, not only during His life, but after death: their followers ceased, as soon as they were gone.