It’s not about what it is, it’s about what it can become.

One of the main weaknesses of mankind is the average man's familiarity with the word 'impossible'.

Riches do not respond to wishes. They respond only to definite plans, backed by definite desires, through constant persistence.

It is a cursed evil to any man to become as absorbed in any subject as I am in mine

I don't want to achieve immortality through my work... I want to achieve it through not dying.

Dad, you've done a lot of great things, but you're a very old man, and old people are useless.

When you know what you want, and want it bad enough, you will find a way to get it.

It is hard to fail, but it is worse never to have tried to succeed.

Real success can only come if there is a change in our societies and in our economics and in our politics.

You don't have to be great to start, but you have to start to be great

We struggle with the complexities and avoid the simplicities.

Our fatigue is often caused not by work, but by worry, frustration and resentment

There is nothing more difficult to carry out, nor more doubtful of success, nor more dangerous to handle, that to institute a new order of things

Why, look at me. I've worked my way up from nothing to a state of extreme poverty.

Inspiration exists, but it has to find you working.

Never make excuses. Your friends don't need them and your foes won't believe them.

I readily absorb ideas from every source, frequently starting where the last person left off

I'm not the smartest fellow in the world, but I can sure pick smart colleagues.

A great secret of success is to go through life as a man who never gets used up.

Personally, I enjoy working about 18 hours a day. Besides the short catnaps I take each day, I average about four to five hours of sleep per night.

Formulate and stamp indelibly on your mind a mental picture of yourself as succeeding. Hold this picture tenaciously and never permit it to fade. Your mind will seek to develop this picture!