Here we learn how pleased God is if people who have lost their faith find
it again, and how compassionate God is towards them. Then there is much joy in the Kingdom of God.

Read online Bible:
Luke 15, 8-10
In here Jesus uses an everyday experience that anyone can have to illustrate this parable.
People lose money or other things because they handle them carelessly. Often it is a huge loss for them, and they feel great joy if they find it after searching for it for a long time. They tell their best friends so that they can share their happiness.
Gospel according to Luke
The Parable of the Lost Coin