When people say they were once 'lost' before becoming Christians, to some it just sounds strange, right? The idea of being 'spiritually' lost stems from a parable Jesus told in the book of Luke chapter 15 verses 1 to 7, which He used to illustrate the value of one soul in God's sight.
Jesus told this story while dining with those considered at the time to be the worst of sinners. The teachers of the religious law judged Him from a distance for associating with such people.
To them Jesus said: "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? And when he finds it, he joyfully puts it on his shoulders and goes home. Then he calls his friends and neighbours together and says, 'Rejoice with me; I have found my lost sheep.' 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."
Jesus used this lost sheep as a metaphor for His love for each individual person. He does not want anyone to die without knowing and entering into a personal relationship with Him. Heaven rejoices over each person who turns to Him.?