Note that the thief is not the devil

BibleGateway.com:

Commentaries - John 10 - Jesus Is the Good Shepherd Who Is Gathering His Flock

: "Jesus uses the shepherd motif to interpret what has just taken place with the former blind man. Judaism is described as a sheep pen, but not all the sheep in the pen belong to Jesus' flock. They are separated out as they recognize his voice and follow him out from the sheep pen. Jesus is gathering his flock together from the pen of official Judaism. Jesus Is the Gate for the Sheep (10:7-10) Because these Jewish leaders did not understand what Jesus was saying he goes back over it again from a different perspective. In this repetition we see God's graciousness, the same graciousness that caused the word of the Lord to come a second time to Jonah (Jon 3:1) and suffered with Israel's waywardness throughout her history. It is the same graciousness we each depend on every day of our lives.

In this second statement Jesus says, I am the gate for the sheep (v. 7). The scene has shifted from the village to the open field. In the summer sheep are sometimes kept out in the pasture overnight. The pen used is simply an enclosure made of piled rocks. There is neither roof nor door, but thorns along the top of the rock walls protect the sheep from wild animals, and the shepherd himself sleeps in the entrance, providing a door (cf. Bailey 1993:11; Beasley-Murray 1987:169). So when Jesus says he is the gate for the sheep (v. 7) he is still using the image of a shepherd, but applying it directly to himself. From this picture of a shepherd sleeping in the entrance we would expect Jesus' role to be the protector of the sheep. Jesus does indeed protect his own (cf. 6:39; 17:12), but the image is developed here in a surprising way. The sheep are to enter through Jesus (v. 9), something not true of the shepherd sleeping in the entrance of a summer shelter! So the image is not that of a door as a barrier for protection, but of a door as a passageway.

Jesus also refines his earlier reference to the thief and robber (v. 1), saying, All who ever came before me were thieves and robbers (v. 8). This is a sweeping generalization. If it were not for references to Moses, the prophets and John the Baptist as witnesses to Jesus (for example, 1:17, 19-36; 5:39), then they would seem to be included in the category of all who ever came before me. But the context of our passage is the condemnation of the Jewish rulers, some of whom have rejected Jesus and others who have faith in him. This sweeping statement shows that these leaders are members of a much larger group. Jesus, the one mediator of salvation, contrasts himself with all others who would claim to be "mediators of salvation" (Beasley-Murray 1987:170). The reason Moses, the law, the prophets and John the Baptist are not included in this condemnation is precisely because they bear witness to Jesus. All who do not bear witness to Jesus, who alone has seen the Father and makes him known (1:18), are not of the truth. They do not bring blessing but rather take it away, like a thief or a robber."

See the rest