John 10

1 “Truly, truly, I say to you, he who does not enter the sheepfold by the door but climbs in by another way, that man is a thief and a robber. 2 But he who enters by the door is the shepherd of the sheep. 3 To him the gatekeeper opens. The sheep hear his voice, and he calls his own sheep by name and leads them out. 4 When he has brought out all his own, he goes before them, and the sheep follow him, for they know his voice. 5 A stranger they will not follow, but they will flee from him, for they do not know the voice of strangers.” 6 This figure of speech Jesus used with them, but they did not understand what he was saying to them.

7 So Jesus again said to them, “Truly, truly, I say to you, I am the door of the sheep. 8 All who came before me are thieves and robbers, but the sheep did not listen to them.

From Calvin's commentary:

This passage should make us deeply ashamed. First, because we are so unused to the voice of our Shepherd that hardly anyone listens to it without indifference. And then because we are so slow and lazy to follow him. I am speaking of the good, or at least the passable, for most of those who claim to be Christ's disciples openly rebel against him. Lastly, as soon as we hear the voice of any stranger, we are carried unstably here and there, and this unsteadiness and levity shows just how little we have advanced in the faith so far. But although the number of believers is less than we would want, and many of this small number continually fall away, faithful teachers have the consolation of knowing that they are heard by God's elect, who are Christ's "sheep." It is our job to work hard and to strive in every way to bring, if possible, the whole world to agreement in the unity of the faith. Meanwhile, we must be content with our number.