No person who bears responsibility can safely make decisions without proper study of his problems and preparation for his work. Jesus' life and teachings exemplify this principle completely. So much emphasis has been placed by many Christian teachers and writers upon the divine nature of Jesus that many assume that there was given him all knowledge and wisdom in some superhuman way entirely different from that by which ordinary human beings attain their knowledge and bases of judgment. Such persons apparently overlook the fact that if that were true Jesus could not have been tempted in all points as we are. From the evidence given in the New Testament, Jesus, when a boy of twelve years of age, showed a remarkable precocity and mental grasp of the deep problems of life in his discussions with the wise men in the Temple. Nevertheless, he did not venture upon teaching in any formal way and making public his convictions regarding life and society until he was some thirty years of age. Moreover, there was a progressive development in his views and plans for the redemption of humanity. During his period of preparation, he made himself master of the Hebraic law and the writings of the leading commentators upon it. Evidently, also, while he was working at his trade of carpenter, and presumably also as master carpenter and contractor and citizen, he had been studying and reflecting most deeply upon the traits of human nature as manifested in the people whom he met and those with whom he had come in contact through his work and studies. When he began his public ministry, he had at his command the most profound knowledge of human motive and of human nature possessed by any of the great teachers of history. While he left us no formal analytical discussion on psychology, and probably never made one, as did Aristotle or Immanuel Kant or William James, none of them had more completely understood the ways in which human hearts and minds are to be touched and convinced so as to change their entire nature. It is not too much to say that as regards the practical working knowledge of human nature and the way in which it is to be influenced and changed, Jesus Christ is the greatest social psychologist of history. He had made himself such by long and patient study during a period of from eighteen to twenty years of preparation. V. LOVE: WELFARE OF HUMANITY: GOLDEN RULE The third great principle laid down by Jesus for the conduct of life is love: devotion to the welfare of others.