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.

There are some poisons which, before they kill men, allay pain and diffuse a soothing sensation through the frame. We may recognize the hour of enjoyment they procure, but we must not separate it from the price at which it was purchased.

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.

The contraction of theological influence has been at once the best measure, and the essential condition of intellectual advance.

Almost all Europe, for many centuries, was inundated with blood, which was shed at the direct instigation or with the full approval of the ecclesiastical authorities.

I venture to maintain that there are multitudes to whom the necessity of discharging the duties of a butcher would be so inexpressibly painful and revolting, that if they could obtain a flesh diet on no other condition, they would relinquish it forever.

The moral duty to be expected in different ages is not a unity of standard, or of acts, but a unity of tendency ... At one time the benevolent affections embrace merely the family, soon the circle expanding includes first a class, then a nation, then a coalition of nations, then all humanity and finally, its influence is felt in the dealings of man with the animal world.