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.

(John 10:1-3 -- ESV)