We feel neither extreme heat nor extreme cold; qualities that are in excess are so much at variance with our feelings that they are impalpable: we do not feel them, though we suffer from their effects.

Nature, which alone is good, is wholly familiar and common.

By a peculiar prerogative, not only each individual is making daily advances in the sciences, and may make advances in morality (which is the science, by way of eminence, of living well and being happy), but all mankind together is making a continual progress in proportion as the universe grows older. So that the whole human race, during the course of so many ages, may be considered as one man who never ceases to live and learn.

Do they think that they have given us great pleasure by telling us that they hold our soul to be no more than wind or smoke, and saying it moreover in tones of pride and satisfaction? Is this then something to be said gaily? Is it not on the contrary something to be said sadly, as being the saddest thing in the world?

Men never do evil so completely and cheerfully as when they do it from religious conviction.

Instinct teaches us to look for happiness outside ourselves.

Knowledge has two extremes. The first is the pure natural ignorance in which all men find themselves at birth. The other extreme is that reached by great minds, who, having run through all that men can know, find they know nothing, and come back again to that same natural ignorance from which they set out; this is a learned ignorance which is conscious of itself.