John Calvin on John 10:6

6. This parable. This is the reason why, proudly vaunting of their wisdom, they rejected the light of Christ; for in a matter not very obscure they are exceedingly dull of apprehension.

But they did not understand what things they were which he spoke to them. In this clause the Greek manuscripts differ. Some copies might be literally rendered, they did not understand what he said Another reading, which I have followed, is more full, though it amounts to the same meaning. The third reading is, that they did not know that he who spoke of himself was the Son of God; but this is not much approved.

John 10:7-10

7. And Jesus again said to them, Verily, verily, I say to you, that I am the door of the sheep. 8. All who have entered before me are thieves and robbers; but the sheep did not hear them. 9. I am the door. If any man enter by me, he shall be saved, and shall go in and out, and find pasture. 10. The thief cometh not but to steal, and to kill, and to destroy; I am come, that they may have life, and that they may have it more abundantly.