I made a difference

There is a man walking on the beach. In the distance he sees a boy throwing something into the ocean. As he gets closer, he sees the boy is surrounded by starfish that have washed up in the tide. The boy reaches down, picks up another starfish and throws it in the water. The man questions the boy, “Don’t you see how many there are? You will never be able to make a difference.” The boy picks up another starfish, throws it into the ocean and says, “I made a difference for that one.”