"For the serious student of the New Testament the problem of the psychic health of Jesus is not to be solved by religious recoil at the thought of such a suggestion, nor by an appeal to history, but it is to be faced and met on the basis of an historical and critical study of the sources of our knowledge concerning Jesus' words and deeds as found in the Gospel literature. The battle is to be fought out on the field of the New Testament, and any shift of the scene of action from this field renders the issue unscientific and indecisive."