By no effort of the understanding, by no stretch of imagination, can I explain to myself how language could have grown out of anything which animals possess, even if we granted them millions of years for that purpose. If anything has a right to the name of specific difference, it is language, as we find it in man, and in man only. Even if we removed the name of specific difference from our philosophic dictionaries, I should still hold that nothing deserves the name of man except what is able to speak. _Science of Thought._ Every language has to be learnt, but who made the language that was to be learnt? It matters little whether we call language an instinct, a gift, a talent, a faculty, or the _proprium_ of man; certain it is that neither language, nor the power of language, nor the conditions under which alone language can exist, are to be discovered anywhere in the whole animal kingdom, except in man. _Science of Thought._ It was Christianity which first broke down the barrier between Jew and Gentile, between Greek and Barbarian, between the white and the black. _Humanity_ is a word which you look for in vain in Plato and Aristotle; the idea of mankind as one family, as the children of one God, is an idea of Christian growth; and the science of mankind, and of the languages of mankind, is a science which, without Christianity, would never have sprung into life. When people had been taught to look upon all men as brethren, then, and then only, did the variety of human speech present itself as a problem that called for a solution in the eyes of thoughtful observers; and from an historical point of view it is not too much to say that the first day of Pentecost marks the real beginning of the science of language. _Science of Language._