The book of nature was open before John with its inexhaustible store of varied instruction. He sought the favor of God, and the Holy Spirit rested upon him, and kindled in his heart a glowing zeal to do the great work of calling the people to repentance, and to a higher and holier life. John was fitting himself, by the privations and hardships of his secluded life, to so control all his physical and mental powers that he could stand among the people as unmoved by surrounding circumstances as the rocks and mountains of the wilderness that had surrounded him for thirty years. (CC 270.5) MC VC