Then, in the third place, there are men, and educated men as the world goes, who deliberately decline to study new truth; and they are men in the scientific field and in the religious field. They purposely refuse to look at anything which would tend to disturb their present accepted belief. In my boyhood I used to hear Dr. John O. Fiske, a famous preacher in Maine. He told a friend of mine, in his old age, that he simply refused to read any book that would tend to disturb his beliefs. Professor William G. T. Shedd, one of the most distinguished theologians of this country, a leading Presbyterian divine, published so I am not slandering him by saying it a statement that he did not consider any book written since the seventeenth century worth his reading. And yet we have a new world since the seventeenth century, a new revelation of God and of man. To follow the teaching of the seventeenth century would be to go wrong in almost every conceivable direction. What is the use of paying any attention to the theological or religious opinions of a man who avows an attitude like that? Faraday, to come now to a scientific illustration, so that you will not think I am too hard on theologians, Faraday belonged to one of the most orthodox sects in England; and he used to say deliberately that he kept his religion and his science apart. He says, "When I go into my closet, I lock the door of my laboratory; and, when I go into my laboratory, I lock the door of my closet." He did very wisely to keep them apart; for, if they had got together, there would certainly have been an explosion. Another scientific illustration is Agassiz. Agassiz unconsciously wrought out and developed some of the most wondrous and beautiful proofs of evolution that the world has ever known; and yet he fought evolution to the last day of his life, simply because he had accepted the other theory. And he got it into his head that there was something about evolution that tended to injure religion and degrade man, not a rational objection, not a scientific objection, but a feeling, a prejudice.