I write with experiences in mind, but I don't write about them, I write out of them.

Be realistic: Plan for a miracle

The one you buy will be the only one that doesn't work.

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

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

Just remember, once you're over the hill you begin to pick up speed.

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

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

A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.

Early to bed and early to rise, Makes a man healthy, wealthy, and wise.

Real knowledge is to know the extent of one's ignorance.

Don't compromise yourself. You are all you've got.

It is not the strength, but the duration, of great sentiments that makes great men.

If you don't behave as you believe, you will end by believing as you behave.

Experience is the only prophecy of wise men.

Not everything that can be counted counts, and not everything that counts can be counted.

Out of suffering have emerged the strongest souls; the most massive characters are seared with scars.

It is neither good nor bad, but thinking makes it so.

Be silent or let thy words be worth more than silence.

Only from the heart can you touch the sky.

Man is the only creature who refuses to be what he is.