When men have appreciated the countless differences which the exercise of that judgment must necessarily produce, when they have estimated the intrinsic fallibility of their reason, and the degree in which it is distorted by the will, when, above all, they have acquired that love of truth which a constant appeal to private judgment at last produces, they will never dream that guilt can be associated with an honest conclusion, or that one class of arguments should be stifled by authority.

In proportion to its power, Protestantism has been as persecuting as Catholicism.

The morals of men are more governed by their pursuits than by their opinions. A type of virtue is first formed by circumstances, and men afterwards make it the model upon which their theories are framed.

All history shows that, in exact proportion as nations advance in civilisation, the accounts of miracles taking place among them become rarer and rarer, until at last they entirely cease.

When it began, Christianity was regarded as a system entirely beyond the range and scope of human reason; it was impious to question; it was impious to examine; it was impious to discriminate. On the other hand, it was visibly instinct with the supernatural. Miracles of every order and degree of magnitude were flashing forth incessantly from all its parts.

The animal world being altogether external to the scheme of redemption, was regarded as beyond the range of duty, and the belief that we have any kind of obligation to its members has never been inculcated - has never, I believe, been even admitted - by Catholic theologians.

The period of Catholic ascendancy was on the whole one of the most deplorable in the history of the human mind. . . . The spirit that shrinks from enquiry as sinful and deems a state of doubt a state of guilt, is the most enduring disease that can afflict the mind of man. Not till the education of Europe passed from the monasteries to the universities, not till Mohammedan science, and classical free thought, and industrial independence broke the sceptre of the Church, did the intellectual revival of Europe begin.