Daniel Defoe in the well-known book Robinson Crusoe bases his story on the need to call upon God in time of trouble. Crusoe had long been isolated on a small island following a shipwreck. He had come to believe firmly that he was the only human being on the island. But one day as he went to the beach to get his boat he was startled to see the footprint of a man in the sand. Crusoe concluded that it was the footprint of a savage. In great fear he hurried back to his cabin. There, while lying on his bed, trembling with fear as he thought of savages, he suddenly thought of the words of scripture: "Call on me in the day of trouble and I will deliver you, and you will glorify me." This thought was of such comfort that Crusoe rose cheerfully from his bed. He exulted in the great comfort that the opportunity to pray to God for deliverance gave him. He returned to his normal daily life without fear.