We have a lot of people revolutionizing the world because they've never had to present a working model.

You can't have a better tomorrow if you are thinking about yesterday all the time.

High achievement always takes place in the framework of high expectation.

An inventor is simply a fellow who doesn't take his education too seriously.

Keep on going and the chances are you will stumble on something, perhaps when you are least expecting it. I have never heard of anyone stumbling on something sitting down.

A problem well stated is a problem half-solved.

You will never stub your toe standing still. The faster you go, the more chance there is of stubbing your toe, but the more chance you have of getting somewhere.

The only time you mustn't fail is the last time you try.

here is a great difference between knowing a thing and understanding it. You can know a lot and not really understand anything.

The world hates change, yet it is the only thing that has brought progress.

If you're doing something the same way you have been doing it for ten years, the chances are you are doing it wrong.

Weren’t all books ultimately related? After all, the same letters filled them, just arranged in a different order. Which meant that, in a certain way, every book was contained in every other!

We're all in this together.

The secret of my influence has always been that it remained secret.

This is government's primary function - to keep us safe - and when large percentages in America don't feel safe, they start asking: What am I paying my taxes for? What is government all about?

I regret things all the time. I've never regretted not saying something. I've only regretted saying something.

Everyone is growing and developing. Everyone has to go through a trial and eror process of finding what is right.

I want to confront myself. I challenge and doubt myself. Basically, what I don't like is to get bored.

When I enrolled in college at age 19, I had a total of eight years of formal classroom education. As a result, I was not comfortable with formal lectures and receiving regular homework assignments.

Because I can't handle the nightmares. Not without you.

You are not Atlas carrying the world on your shoulder. It is good to remember that the planet is carrying you.