HON. D.LITT. OF OXFORD, DURHAM, AND DUBLIN, AND HON. LL.D. OF EDINBURGH, GLASGOW, AND ABERDEEN UNIVERSITIES; REGIUS PROFESSOR OF MODERN HISTORY, CAMBRIDGE UNIVERSITY AUTHOR OF “HISTORY OF THE LATTER ROMAN EMPIRE,” “HISTORY OF GREECE,” “HISTORY OF THE EASTERN ROMAN EMPIRE,” ETC. Copyright, 1913, by HENRY HOLT AND COMPANY THE UNIVERSITY PRESS, CAMBRIDGE, U.S.A. IT is a common saying that thought is free. A man can never be hindered from thinking whatever he chooses so long as he conceals what he t

The repugnance due to mere mental laziness is increased by a positive feeling of fear. The conservative instinct hardens into the conservative doctrine that the foundations of society are endangered by any alterations in the structure. It is only recently that men have been abandoning the belief that the welfare of a state depends on rigid stability and on the preservation of its traditions and institutions unchanged. Wherever that belief prevails, novel opinions are felt to be dangerous as well

To return to the early philosophers, who were mostly materialists, the record of their speculations is an interesting chapter in the history of rationalism. Two great names may be selected, Heraclitus and Democritus, because they did more perhaps than any of the others, by sheer hard thinking, to train reason to look upon the universe in new ways and to shock the unreasoned conceptions of common sense. It was startling to be taught, for the first time, by Heraclitus, that the appearance of stabi

No father of the Church has been more esteemed or enjoyed higher authority than St. Augustine (died A.D. 410). He formulated the principle of persecution for the guidance of future generations, basing it on the firm foundation of Scripture—on words used by Jesus Christ in one of his parables, “Compel them to come in.” Till the end of the twelfth century the Church worked hard to suppress heterodoxies. There was much [56] persecution, but it was not systematic. There is reason to think that in th

The logical results of Montaigne’s scepticism [75] were made visible by his friend Charron, who published a book On Wisdom in 1601. Here it is taught that true morality is not founded on religion, and the author surveys the history of Christianity to show the evils which it had produced. He says of immortality that it is the most generally received doctrine, the most usefully believed, and the most weakly established by human reasons; but he modified this and some other passages in a second edit

In Europe, public opinion was not ripe for separation, inasmuch as the most powerful religious bodies were alike in regarding toleration as wicked indifference. But it was introduced in a small corner of the new world beyond the Atlantic in the seventeenth century. The Puritans who fled from the intolerance of the English Church and State and founded colonies in New England, were themselves equally intolerant, not only to Anglicans and Catholics, but to Baptists and Quakers. They set up theocrat

Spinoza, the Jewish philosopher of Holland, owed a great deal to Descartes and (in political speculation) to Hobbes, but his philosophy meant a far wider and more open breach with orthodox opinion than either of his masters had ventured on. He conceived ultimate reality, which he called God, as an absolutely perfect, impersonal Being, a substance whose nature is constituted by two “attributes”— thought and spatial extension. When Spinoza speaks of love of God, in which he considered happiness to

Geology shook the infallibility of the Bible, but left the creation of some prehistoric Adam and Eve a still admissible hypothesis. Here however zoology stepped in, and pronounced upon the origin of man. It was an old conjecture that the higher forms of life, including [180] man, had developed out of lower forms, and advanced thinkers had been reaching the conclusion that the universe, as we find it, is the result of a continuous process, unbroken by supernatural interference, and explicable by

The reasoned justification of liberty of thought is due to J. S. Mill, who set it forth in his work On Liberty , published in 1859. This book treats of liberty in general, and attempts to fix the frontier of the region in which individual freedom should be considered absolute and unassailable. The second chapter considers liberty of thought and discussion, and if many may think that Mill unduly minimized the functions of society, underrating its claims as against the individual, few will deny th