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A sheep that runs away and lives for 5 years away from the flock without being caught is still the property of the owner and still the responsibility of the shepherd. Most shepherds will not be bothered enough to go looking for a single sheep that runs away, but of course the good perfect shepherd will strive to bring it back to the flock. We are the sheep and CHrist is the Perfect Good Shepherd, so we may run away, but once we are Christs, we will always remain so.
Have you not read the parable of the lost sheep, unless that sheep is brought or comes back to the Lord in repentance then it will remain lost.
Luke 15 The Parable of the Lost Sheep
15 Now the tax collectors and sinners were all gathering around to hear Jesus. 2 But the Pharisees and the teachers of the law muttered, “This man welcomes sinners and eats with them.”
3 Then Jesus told them this parable: 4 “Suppose one of you has a hundred sheep and loses one of them. Doesn’t he leave the ninety-nine in the open country and go after the lost sheep until he finds it? 5 And when he finds it, he joyfully puts it on his shoulders 6 and goes home. Then he calls his friends and neighbors together and says, ‘Rejoice with me; I have found my lost sheep.’ 7 I tell you that in the same way there will be more rejoicing in heaven over one sinner who repents than over ninety-nine righteous persons who do not need to repent.