From G.K. Chesterton's The Everlasting Man:
"There is a sort of notion in the air everywhere that all the religions are equal because all the religious founders were rivals, that they are all fighting for the same starry crown. It is quite false. The claim to that crown, or anything like that crown, is really so rare as to be unique. Mahomet did not make it any more than Micah or Malachi. Confucius did not make it any more that Plato or Marcus Aurelius. Buddha never said he was Bramah. [...] The truth is that, in the common run of cases, it is just as we should expect it to be, in common sense and certainly in Christian philosophy. [...] Normally speaking, the greater a man is, the less likely he is to make the very greatest claim. Outside the unique case we are considering, the only kind of man who ever does make that kind of claim is a very small man; a secretive or self-centered monomaniac. Nobody can imagine Aristotle claiming to be the father of gods and men, come down from the sky; though we might imagine some insane Roman Emperor like Caligula claiming it for him, or more probably for himself. Nobody can imagine Shakespeare talking as if he were literally divine; though we might imagine some crazy American crank finding it as a cryptogram in Shakespeare's works, or preferably in his own works. It is possible to find here and there human beings who make this supremely superhuman claim. It is possible to find them in lunatic asylums; in padded cells; possibly in strait waistcoats. [...] [A delusion of divinity] can be found, not among prophets and sages and founders of religions, but only among a low set of lunatics. But this is exactly where the argument becomes intensely interesting; because the argument proves too much. For nobody supposes that Jesus of Nazareth was that sort of person. No modern critic in his five wits thinks that the preacher of the Sermon on the Mount was a horrible half-witted imbecile that might be scrawling stars on the walls of a cell. No atheist or blasphemer believes that the author of the Parable of the Prodigal Son was a monster with one mad idea like a cyclops with one eye. Upon any possible historical criticism, he must be put higher in the scale of human beings than that. Yet by all analogy we have really to put him there or else in the highest place of all. [...] If Christ was simply a human character, he really was a highly complex and contradictory human character. For he combined exactly the two things that lie at the two extremes of human variation. He was exactly what the man with a delusion never is; he was wise; he was a good judge. What he said was always unexpected; but it was always unexpectedly magnanimous and often unexpectedly moderate. Take a thing like the point of the parable of the tares and the wheat. It has the quality that unites sanity and subtlety. It has not the simplicity of a madman. It has not even the simplicity of a fanatic. It might be uttered by a philosopher a hundred years old, at the end of a century of Utopias. Nothing could be less like this quality of seeing beyond and all round obvious things, than the condition of the egomaniac with the one sensitive spot on his brain. I really do not see how these two characters could be convincingly combined, except in the astonishing way in which the creed combines them. For until we reach the full acceptance of the fact as a fact, however marvellous, all mere approximations to it are actually further and further away from it. Divinity is great enough to be divine; it is great enough to call itself divine. But as humanity grows greater, it grows less and less likely to do so. God is God, as the Moslems say; but a great man knows he is not God, and the greater he is the better he knows it. That is the paradox; everything that is merely approaching to that point is merely receding from it. Socrates, the wisest man, knows that he knows nothing. A lunatic may think he is omniscience, and a fool may talk as if he were omniscient. But Christ is in another sense omniscient if he not only knows, but knows that he knows."