I recently heard a talk by Nancy Alcorn of Mercy Ministries describing the lost...
There are many sheep in Australia and towards the end of the day typically we would see one sheep with his head down eating grass and the rest of the sheep have walked away and are then taken to an enclosure. The lone sheep eating, lifts up its head, can't see all the other sheep and says to itself, "oh I'm lost".
It's the same with people who are busy doing their lives, working, learning, looking after the children and so on, that when they look up day to say oh I'm lost!