What is the moral of the parable of the lost coin?

The parables of Jesus are usually concerned with spiritual truths rather than morals. Parables are a way of teaching spiritual truths. The spiritual truth is hidden in stories of everyday life - "an earthly story with a heavenly meaning." The real meaning of the parable is hidden to those who are not seeking spiritual truth or are not willing to think about the parable.

The parable of the Lost Coin is the second parable in a group of three parables - The Lost Sheep, The Lost Coin and the Lost Son. These three parables are about God's love for people who are lost and, in the context of the parables, God's love for the 'lost' nation of Israel.