My first popular book, 'A Brief History of Time,' aroused a great deal of interest, but many found it difficult to understand.

Time can behave like another direction in space under extreme conditions.

Intelligence is the ability to adapt to change.

So remember to look up at the stars and not down at your feet. Try to make sense of what you see and hold on to that childlike wonder about what makes the universe exist.

The thing about smart people is that they seem like crazy people to dumb people.

It is all right to make mistakes; nothing is perfect because with perfection, we would not exist.

I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.

People won't have time for you if you are always angry or complaining.

It is reasonable to ask who or what created the universe, but if the answer is God, then the question has merely been deflected to that of who created God.

It is very important for young people keep their sense of wonder and keep asking why.

The development of full artificial intelligence could spell the end of the human race.

There's a lot of randomness in the decisions that people make.

Stop your ignorance! Seek for wisdom and give understanding a way!

Love changes everything. I never suspected it would be so. Requited love, I should say ...

And in movies you must be a gambler. To produce films is to gamble.

I can't know everything, pretend you're an orphan.

The future of this republic is in the hands of the American voter.

Praise, my soul, the King of Heaven; To his feet thy tribute bring. Ransomed, healed, restored, forgiven, Who like me his praise should sing?

I think that time moves slower in painting. And maybe that accounts for a lot of the anxiety around painting in the last 40 or 50 years.

Every single second is an opportunity to change your life, because in any moment you can change the way you feel.

There will be no withdrawal without written orders and these orders shall never be issued.