For every man there exists a bait which he cannot resist swallowing.

I'm sorry I wrote you such a long letter; I didn't have time to write a short one.

It's not whether you got knocked down; it's whether you get back up.

I not only use all the brains that I have, but all that I can borrow.

I am always doing that which I can not do, in order that I may learn how to do it.

To attain the impossible, one must attempt the absurd.

Wealth is not about having a lot of money; it's about having a lot of options.

When all is said and done, more is said than done.

The greatest sin is to think yourself weak

There are no traffic jams on the extra mile.

Drink moderately, for drunkenness neither keeps a secret nor observes a promise.

I am always doing what I cannot do yet, in order to learn how to do it.

Aim for the highest.

Defeat is not defeat unless accepted as a reality-in your own mind.

Everything I've ever done was out of fear of being mediocre.

I don't think necessity is the mother of invention. Invention ... arises directly from idleness, possibly also from laziness. To save oneself trouble.

A man can't soar too high, when he flies with his own wings.

It is greed to do all the talking but not to want to listen at all.

You'll never do a whole lot unless you're brave enough to try.

If you spend too much time thinking about a thing, you'll never get it done.

I don’t think we are going to become extinct. We are very clever and very resourceful.