When he was on earth, Jesus spent a lot of time browsing over the lost and found table of the world (it was why God sent him). But the Pharisees saw this and murmured: why do you spend so much time with all that junk?!? Hookers, crooked IRS agents, druggies, AIDS victims. In these two parables, Jesus answers that question: because they are mine! They are lost and I’ve come to find them! 
Scripture:  Luke 15:1-10