John 10:25

Jesus answered them, I told you, and ye believed not: the works that I do in my Father's name, these bear witness of me. But ye believe not, because ye are not of my sheep.

Jesus was not deceived by the sweet reasonableness of their friendly (?) question, for he well knew their murderous designs.

I told you, and ye believed not ... Christ's bold declaration of himself as the Shepherd of Israel was clear enough in all of its glorious Messianic implications; but the spiritual overtones of that title made it useless for the diabolical purposes of the Pharisees; and what is equally important, they did not believe it. From their viewpoint, therefore, what they were trying to do was to get Jesus to commit blasphemy (in their eyes) and to do so in terminology that could also be used by them as a legal charge before the governor. The proof of this is what they actually did when Jesus did swear under oath that he was the Christ (Mark 14:62ff). Their own gross immorality is inherent in what they THOUGHT they were doing. They THOUGHT they were trying, to get a fellow-mortal (as they thought) to commit a capital crime (as they viewed it) for the sake of getting him killed! No wonder Jesus addressed them as "Ye serpents; ye offspring of vipers" (Matthew 23:33).

The works that I do in my Father's name ... brought forward the mighty signs Jesus did, but that subject was extremely distasteful to those hypocrites. They only wanted some basis for having him legally murdered.

Ye believe not, because ye are not of my sheep ... These words recalled his declaration of himself as the Good Shepherd, which by that time they fully understood in all its implications (John 10:33). Here, as always, Jesus made unbelief to be the result of immoral character. The reason those men did not believe in Jesus was lodged in their character which revealed them to be no part of the spiritual Israel. "Ye are not of my sheep."