John 10:1
1“Most certainly, I tell you, one who doesn’t enter by the door into the sheep fold, but climbs up some other way, is a thief and a robber.
Truly, truly: the fold has a door, and climbing another way is theft. Wesley: the door is Christ, the only lawful entrance; the sheepfold is the Church; a thief and robber in God’s account—such were the teachers Jesus had just been answering in chapter 9.
Office without Christ is not shepherding. The warning is public and sincere. Hearers can tell a climber from a door-man; they are not told to stay under whoever holds the keys of the fold.
Calvin: scribes and priests were reckoned pastors, yet Christ will not let that title bless their unbelief. Not all who outwardly claim a place in the Church are shepherds or sheep. No plague is more destructive than wolves in shepherds’ garb.
The honorable name “Church” makes the distinction between true and false doctrine more urgent, not less. Weak consciences need not panic when rulers resist the Gospel; the door, not the occupancy of the fold, tells who belongs.