“Sometimes the hardest thing in life is to know which bridge to cross and which to burn.”

No one gossips about other people’s secret virtues.

The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.

Is there any knowledge in the world that is so certain that no reasonable man could doubt it?

Three passions, simple but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and unbearable pity for the suffering of mankind.

Fear is the parent of cruelty, and therefore it is no wonder if cruelty and religion have gone hand in hand.

It has been said that man is a rational animal. All my life I have been searching for evidence that could support this.

Anything you’re good at contributes to happiness.

We love our habits more than our income, often more than our life.

Sin is geographical.

The good life is inspired by love and guided by knowledge.

Mathematics, rightly viewed, possesses not only truth but supreme beauty – a beauty cold and austere.

Extreme hopes are born from extreme misery.

Science may set limits to knowledge, but should not set limits to imagination.

Machines have altered our way of life, but not our instincts. Consequently, there is maladjustment.

Every man, wherever he goes, is encompassed by a cloud of comforting convictions, which move with him like flies on a summer day.

Never try to discourage thinking, for you are sure to succeed.

It is good to have an end to journey towards; but it is the journey that matters, in the end.

Do I do this to you?, he wondered, as he watched her eat. Or is this just the relief of being out from under the forbidden eye of that husband of yours?

The road goes upward towards the light; but the laden traveler may never reach the end of it.

In the end, the only thing between us was silence.

The end justifies the means. But what if there never is an end? All we have is means.

The end may justify the means as long as there is something that justifies the end.

In politics, what begins in fear usually ends in folly.

Be politically correct, but please don’t bother other people with conversation about being politically correct, because that’s the end of everything. You want to create boredom? Be politically correct in your conversation.