A good many people, then, who are called educated, are not educated at all. I have had this question asked me repeatedly: If your position is true, here is a college graduate, and here is another; and here is a minister of such a denomination, or a priest of the Catholic Church; why do they not accept your ideas? Do you not see, however, that this so-called education may stand squarely in the way?
Now, in the second place, I want to dwell a little on the difficulty of people's getting rid of a theory which possesses their minds, and substituting for it another theory. And I wish you to note that it is not a religious difficulty nor a theological difficulty nor a Baptist difficulty nor a Presbyterian difficulty: it is a human difficulty. There is no body of people on the face of the earth that is large enough to contain all the world's bigotry. It overflows all fences and gets into all enclosures. Discussing the subject a little while ago, by correspondence with a prominent scientific man in New England, I got from him the illustrations which I hold in my hand, tending to set forth how difficult it is for scientific men themselves to get rid of a theory which they have been working for and trying to prove, and substitute for it another theory. I imagine that there may be a physiological basis for the difficulty. I suggest it, at any rate. We say that the mind tends to run in grooves of thought. That means, I suppose, that there is something in the molecular movements of the brain that comes to correspond to a well-trodden pathway. It is easy to walk that path, and it is not easy to get out of it. Let it rain on the top of a hill; and, if you watch the water, you will see that it seeks little grooves that have been worn there by the falling of past rains, and that the little streams obey the scientific law and follow the lines of least resistance. There comes a big shower, a heavy downfall; and perhaps it will wash away the surface and change the beds of these old watercourses, create new ones. So, then, when there comes a deluge of new truth, it washes away the ruts along which people have been accustomed to think; and they are able to reconstruct their theories. Now let me give you some of these scientific illustrations. First, that heat is a mode of motion was proved by Sir Humphry Davy and Count Rumford before 1820. In 1842 Joule, of Manchester, England, proved the quantitative relation between mechanical energy and heat. In 1863 note the dates Tyndall gave a course of lectures on heat as a mode of motion, and was even then sneered at by some scientific men for his temerity. Tait, of Glasgow, was particularly obstreperous. To-day nobody questions it; and we go back to Sir Humphry Davy and Count Rumford for our proofs, too. It was proved scientifically proved then; but it took the world all these years, even the scientific world, to get rid of its prejudices in favor of some other theory, and see the force of the proof.
Now, in the second place, it was held originally that light was a series of corpuscles that flew off from a heated surface; but Thomas Young, about the year 1804, demonstrated the present accepted theory of light. But it was fought for years. Only after a long time did the scientific world give up its prejudice in favor of the theory that was propounded by Newton. But to-day we go back to Young, and see that he demonstrated it beyond question.
In the third place, take another fact. Between 1830 and 1845 Faraday worked out a theory of electrical and magnetic phenomena. It was proved to be correct. Maxwell, a famous chemist in London, looked over the matter, and persuaded himself that Faraday was right; but nobody paid much attention to either of them; until after a while the scientific world, through the work of its younger men, those least wedded to the old-time beliefs, conceded that it must be true.
The Nebular Theory was proved and worked out by Kant more than a hundred and thirty years ago. In 1799 Laplace worked it out again; but it was a long time before it was accepted. And now we go back to Kant and Laplace for our demonstration.
Darwin's "Origin of Species" was published in 1859. But it was attacked by scientists as well as theologians on every hand. Huxley even looked at it with a good deal of hesitancy before he accepted it. To-day, however, everybody goes back to the "Origin of Species," and finds the whole thing there, demonstration and all.
Lyell published a book on the antiquity of man in 1863. It was twenty- five years before all the scientific men of the world were ready to give up the idea that man had been on the earth more than six or eight thousand years.
So we find that it is not theologians only; it is scientists, too, that find it difficult to accept new ideas. I know scientific men among my personal friends who are simply incapable of being hospitable to an idea that would compel them to reconstruct a theory that they have already accepted. Why are not all educated men Unitarians? Why do not scientific men accept demonstrated truth when it is first demonstrated as truth? It puts them to too much trouble. It touches their pride. They do not like to feel that they have thrown away half their lives following an hypothesis that is not capable of being substantiated.
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.