Davey and Goliath

The Hansen family goes on an island for a picnic and some exploration. While on the island and after having so much fun, the tide goes out, which means that they have to stay longer. As it is mentioned that they have to wait for the tide to return before they can leave, Davey asks how they know the tide will return. Davey's mother replies that God made it so that it will return and that we can always count on it returning. (C.1960)