Never pretend to a love which you do not actually feel, for love is not ours to command.

There are a terrible lot of lies going around the world, and the worst of it is half of them are true.

What a pity, when Christopher Colombus discovered America, that he ever mentioned it.

They always say time changes things, but you actually have to change them yourself.

Brain: an apparatus with which we think we think.

The brain is a wonderful organ. It starts working the moment you get up in the morning and does not stop until you get into the office.

Aristotle was famous for knowing everything. He taught that the brain exists merely to cool the blood and is not involved in the process of thinking. This is true only of certain persons.

As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.

In mathematics you don't understand things. You just get used to them.

There's a fine line between genius and insanity. I have erased this line.

Mediocrity knows nothing higher than itself, but talent instantly recognizes genius.

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

It is easier to exclude harmful passions than to rule them, and to deny them admittance than to control them after they have been admitted.

If you don't risk anything you risk even more

The world is a conductor of acoustic resonance…

To be alone is to be different, to be different is to be alone.

I do not agree on what you say, but I would give my life in order to make you say it.

The man who said I rather be lucky and good saw deeply into life….

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

All human actions have one or more of these seven causes: chance, nature, compulsion, habit, reason, passion, and desire.

Eternal nothingness is fine if you happen to be dressed for it.

Difficulties strengthen the mind, as labour the body.

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

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

It does not matter how slowly you go so long as you do not stop.