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

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.

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.

I am not interested in the past. I am interested in the future, for that is where I expect to spend the rest of my life.

If I die on my way to the dance, it will be better than to survive having never lifted my feet.

You stole it from the master.""Who stole it from me. What I did simply set the universe back in order.

Science, as opposed to technology, does violence to common sense.

Dullness is a kind of luxury.

Books are men of higher stature.

When one is engaged in a desperate defense of one's world and its values, nothing can be given away, any breach in the walls might be fatal, every point must be defended to the death.

That's why you did it. You wanted your world to collapse around you. You wanted everything to get as dark as possible.

In the end, the sign of Aretha Franklin's artistry is that she always leaves her mark - first, on the music, then on us.

When the word 'nostalgia' was coined in the 18th century, it was used to describe a pathology - not so much a sense of lost time, but a severe homesickness.

There is no way now to get around some use of embryos. But my goal is to avoid using them.