He that entereth by the door - This was the way in which a shepherd had access to his flock. In John 10:7 Jesus says he is the door. In this place he refers to those who by him - that is, in accordance with his spirit and law become ministers of religion.
Is the shepherd of the sheep - Christ does not here refer to himself, for he is the way or door by which others enter; but he refers to all the ministers of the gospel who have access to the church by him. In the original, the article "the" is missing before the word shepherd - "is a shepherd." By his entering in this manner he shows that he is a shepherd one who cares for his flock, and does not come to kill and destroy.

He that entereth in by the door - Observe here the marks, qualities, and duties of a good pastor; The first mark is, that he has a lawful entrance into the ministry by the internal call of Christ, namely, by an impulse proceeding from his Spirit, upon considerations which respect only his glory, and upon motives which aim at nothing but the good of his Church, the salvation of souls, the doing the will of God, and the sacrificing himself entirely to his service, and to that of the meanest of his flock.

But he that entereth in by the door,.... With a divine commission, and by a divine authority, who comes not of himself, but is sent; does not take the honour to himself, or thrust in himself, and assume an office to himself, but is called unto it, and invested in it, he
is the shepherd of the sheep; by whom Christ means himself, as is evident from John 10:11, whose the sheep are, and who takes care of them, and feeds them, as a shepherd does his flock; and which holds true of any under shepherd, having his mission and commission, and deriving his authority from Christ.

he that entereth in by the door is the shepherd of the sheep--a true, divinely recognized shepherd.

He that entereth in by the door. The one who comes in by the door is the shepherd. The figure is very plain to those familiar with Eastern sheepfolds. The door is for the shepherd and the sheep, while those who get in otherwise are robbers who seek to prey upon the sheep.