Doubt is the origin of wisdom

The only real laughter comes from despair.

Great acts are made up of small deeds.

Intellectuals solve problems, geniuses prevent them.

Happiness is not an ideal of reason, but of imagination.

Empty pockets never held anyone back. Only empty heads and empty hearts can do that.

There is an art, or rather a knack to flying. The knack lies in learning how to throw yourself at the ground and miss.

It’s your road and yours alone. Others may walk it with you, but no one can walk it for you.

All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

This is something basic to be understood: the ego must come to a peak, it must be strong, it must have attained an integrity only then can you dissolve it.

If you're happy, don't worry you'll get over it.

There's no sense in being precise when you don't even know what you're talking about.

Whatever it is you're seeking won't come in the form you're expecting.

Courage is resistance to fear, mastery of fear - not absence of fear.

There is always time to add a word, never to withdraw one.

For we walk by faith, not by sight

Beer: The cause of, and solution to, all of life's problems.

To a wise and good man the whole earth is his fatherland.

An understanding of the natural world is a source of not only great curiosity, but great fulfilment.

Instinct is a marvellous thing. It can neither be explained nor ignored.

Simplicity is the ultimate sophistication.