Every great advance in natural knowledge has involved the absolute rejection of authority.

There is always some madness in love. But there is also always some reason in madness.

Wise men talk because they have something to say; fools, because they have to say something.

When a man says he approves of something in principle, it means he hasn't the slightest intention of putting it into practice.

Glory is fleeting, but obscurity is forever.

Where we have strong emotions, we're liable to fool ourselves.

The marvel of all history is the patience with which men and women submit to burdens unnecessarily laid upon them by their governments.

If you pick up a starving dog and make him prosperous, he will not bite you. This is the principal difference between a dog and a man.

The art of being wise is the art of knowing what to overlook.

I suppose a barrel of monkeys would be a lot of fun, unless it's been sealed for 6 or 7 months. Then it's just 55 gallons of Ebola virus.

Tact is the knack of making a point without making an enemy.

Get the facts, or the facts will get you. And when you get them, get them right, or they will get you wrong.

It is impossible to defeat an ignorant man in argument.

You don't get anything clean without getting something else dirty.

The cloning of humans is on most of the lists of things to worry about from Science, along with behavior control, genetic engineering, transplanted heads, computer poetry and the unrestrained growth of plastic flowers.

I am extraordinarily patient provided I get my own way in the end.

The whole dream of democracy is to raise the proletarian to the level of stupidity attained by the bourgeois.

Writing is the only profession where no one considers you ridiculous if you earn no money.

You cannot slander human nature; it is worse than words can paint it.

It is dangerous to be right when the government is wrong.