When one sheep is lost from the flock a good shepherd will be excited that he is found. He is overjoyed for that one sheep more than for all of his others that have been safe. Jesus is the great shepherd and just like with the one stray sheep, Jesus rejoices when even just one single soul is saved from Hell.

Luke 15:

Tax collectors and other notorious sinners often came to listen to Jesus teach. 2 This made the Pharisees and teachers of religious law complain that he was associating with such sinful people—even eating with them!

3 So Jesus told them this story: 4 “If a man has a hundred sheep and one of them gets lost, what will he do? Won’t he leave the ninety-nine others in the wilderness and go to search for the one that is lost until he finds it? 5 And when he has found it, he will joyfully carry it home on his shoulders. 6 When he arrives, he will call together his friends and neighbors, saying, ‘Rejoice with me because I have found my lost sheep.’ 7 In the same way, there is more joy in heaven over one lost sinner who repents and returns to God than over ninety-nine others who are righteous and haven’t strayed away!