John 10
The door of the sheep
Verily, verily, I say unto you, He that entereth not by the door into the sheepfold, but climbeth up some other way, the same is a thief and a robber. But he that entereth in by the door is the shepherd of the sheep. To him the porter openeth; and the sheep hear his voice: and he calleth his own sheep by name, and leadeth them out. And when he putteth forth his own sheep, he goeth before them, and the sheep follow him: for they know his voice. And a stranger will they not follow, but will flee from him: for they know not the voice of strangers. This parable spake Jesus unto them: but they understood not what things they were which he spake unto them. Then said Jesus unto them again, Verily, verily, I say unto you, I am the door of the sheep. All that ever came before me are thieves and robbers: but the sheep did not hear them. I am the door: by me if any man enter in, he shall be saved, and shall go in and out, and find pasture. The thief cometh not, but for to steal, and to kill, and to destroy: I am come that they might have life, and that they might have it more abundantly.
Jesus describes a sheepfold: the shepherd enters by the door, the sheep know his voice, and he leads them out, while thieves climb in another way. When his hearers do not understand, Jesus explains: "I am the door." Those who enter through him will find pasture; he came so that they may have life in abundance.
What does this mean?
"Parable" in both translations renders a Greek word for a figure of speech or riddle, not the story-parables of the other Gospels. "Porter" (KJV) means gatekeeper. "More abundantly" means life in full measure.
Historical context
Sheep were often kept at night in walled pens, and a shepherd might lie across the entrance. Several flocks could share a fold, each recognising its own shepherd's call. In the Old Testament, Israel's leaders are often called shepherds, and Ezekiel 34 condemns bad shepherds who exploit the flock.
Why does it matter?
The discourse follows directly from chapter 9 with no break, so the "thieves" may hint at the leaders who threw out the healed man. "I am the door" is the third of John's "I am" sayings with an image.
Editorial notes, not scripture.