“Generally speaking, the errors in religion are dangerous; those in philosophy only ridiculous.”

When men are most sure and arrogant they are commonly most mistaken, giving views to passion without that proper deliberation which alone can secure them from the grossest absurdities.

Any pride or haughtiness, is displeasing to us, merely because it shocks our own pride, and leads us by sympathy into comparison, which causes the disagreeable passion of humility.

How can we satisfy ourselves without going on in infinitum? And, after all, what satisfaction is there in that infinite progression?

What a peculiar privilege has this little agitation of the brain which we call ‘thought’

It is an absurdity to believe that the Deity has human passions, and one of the lowest of human passions, a restless appetite for applause

Tis not unreasonable for me to prefer the destruction of the whole world to the scratching of my finger.

The bigotry of theologians is a malady which seems almost incurable.

I weigh the one miracle against the other and according to the superiority which I discover, I pronounce my decision.

The science of man is the only solid foundation for the other sciences.

Carelessness and in-attention alone can afford us any remedy. For this reason I rely entirely upon them.

But the greatest part of mankind float between vice and virtue.

I never knew anyone, that examined and deliberated about nonsense, who did not believe it before the end of his enquiries.

Where am I, or what? From what causes do I derive my existence, and to what condition shall I return?

Reason is, and ought only to be the slave of the passions, and can never pretend to any other office than to serve and obey them.

It is difficult for a man to speak long of himself without vanity.

Nothing is more usual than for philosophers to encroach upon the province of grammarians; and to engage in disputes of words, while they imagine that they are handling controversies of the deepest importance and concern

Death is never dangerous. Once death happens, all danger ceases.

Where do you go when you don’t even know where the danger is coming from?

Diseases of the soul are more dangerous and more numerous than those of the body.

There’s some real utility in gratitude. It’s also good protection against the dangers of victimhood and resentment.

And if you think tough men are dangerous, wait until you see what weak men are capable of.

Ideologies are substitutes for true knowledge, and ideologues are always dangerous when they come to power, because a simple-minded I-know-it-all approach is no match for the complexity of existence.

Dare, instead, to be dangerous. Dare to be truthful. Dare to articulate yourself, and express (or at least become aware of) what would really justify your life.

I consider the official Catholic attitude on divorce, birth control, and censorship exceedingly dangerous to mankind.