Sanity is madness put to good use.

Faith in the supernatural is a desperate wager made by man at the lowest ebb of his fortunes.

Nature is like a beautiful woman that may be as delightfully and as truly known at a certain distance as upon a closer view; as to knowing her through and through; that is nonsense in both cases, and might not reward our pains.

Happiness is impossible, and even inconceivable, to a mind without scope and without pause, a mind driven by craving, pleasure, or fear. To be happy, you must be reasonable, or you must be tamed. You must have taken the measure of your powers, tasted the fruits of your passion, and learned your place in the world and what things in it can really serve you. To be happy, you must be wise.

Intolerance is a form of egotism, and to condemn egotism intolerantly is to share it.

Progress, far from consisting in change, depends on retentiveness. When change is absolute there remains no being to improve and no direction is set for possible improvement: and when experience is not retained, as among savages, infancy is perpetual. Those who cannot remember the past are condemned to repeat it. In the first stage of life the mind is frivolous and easily distracted; it misses progress by failing in consecutiveness and persistence. This is the condition of children and barbarians, in which instinct has learned nothing from experience.

An artist is a dreamer consenting to dream of the actual world.