A story I heard somewhere (could have been in a penta-costal church).

There was a boy who would go to a beach every morning, to pick up starfish that were thrown to the shore by the tide, and threw them back into the sea. One day, a man saw him and said, "Why are you doing this? It doesn't change anything; they will be on the shore tomorrow just as well." The boy, unfazed, picked up another starfish, showed to the man, and said, "For this starfish, it does matter." And he threw it into the sea.