In John 10:22-30 Jesus is back in Jerusalem for the feast of dedication (Hanukkah) The Jewish leaders ask, “how long will you keep us in doubt? Tell us if you are the Christ”. Jesus tells them that He has already provided ample teaching and signs.
The real problem Jesus says, is they are not of His sheep. His sheep hear Him and follow Him and enjoy great security. In fact, Jesus says of His sheep, “I give them eternal life and they shall never perish”.
Does this mean it is impossible for a follower of Jesus to go astray and be lost?