“WHEN we are asked to specify the debt which civilization owes to the Greeks, their [22] achievements in literature and art naturally occur to us first of all. But a truer answer may be that our deepest gratitude is due to them as the originators of liberty of thought and discussion. For this freedom of spirit was not only the condition of their speculations in philosophy, their progress in science, their experiments in political institutions; it was also a condition of their literary and artistic excellence. Their literature, for instance, could not have been what it is if they had been debarred from free criticism of life. But apart from what they actually accomplished, even if they had not achieved the wonderful things they did in most of the realms of human activity, their assertion of the principle of liberty would place them in the highest rank among the benefactors of the race; for it was one of the greatest steps in human progress.”
… “The struggle of reason against authority has ended in what appears now to be a decisive and permanent victory for liberty. In the most civilized and progressive countries, freedom of discussion is recognized as a [248] fundamental principle. In fact, we may say it is accepted as a test of enlightenment, and the man in the street is forward in acknowledging that countries like Russia and Spain, where opinion is more or less fettered, must on that account be considered less civilized than their neighbours. All intellectual people who count take it for granted that there is no subject in heaven or earth which ought not to be investigated without any deference or reference to theological assumptions. No man of science has any fear of publishing his researches, whatever consequences they may involve for current beliefs. Criticism of religious doctrines and of political and social institutions is free. Hopeful people may feel confident that the victory is permanent; that intellectual freedom is now assured to mankind as a possession for ever; that the future will see the collapse of those forces which still work against it and its gradual diffusion in the more backward parts of the earth. Yet history may suggest that this prospect is not assured. Can we be certain that there may not come a great set-back? For freedom of discussion and speculation was, as we saw, fully realized in the Greek and Roman world, and then an unforeseen force, in the shape of Christianity, came in and laid chains upon the human mind and [249] suppressed freedom and imposed upon man a weary struggle to recover the freedom which he had lost. Is it not conceivable that something of the same kind may occur again? that some new force, emerging from the unknown, may surprise the world and cause a similar set-back? The possibility cannot be denied, but there are some considerations which render it improbable (apart from a catastrophe sweeping away European culture).”
(from “A History of Freedom of Thought” by J. B. (John Bagnell) Bury)