It is impossible to imagine a four-dimensional space. I personally find it hard enough to visualize a three-dimensional space!

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.

Everyone who has any familiarity with psychology knows about the danger of disowning the murderer within. Far fewer people understand the tragedy of disowning the hero within.

Sleep comes, no matter how deep the sadness cuts. It’s like a gift from the universe.

While sight may deceive you, touch rarely does.

He who doesn't sin, is the greatest sinner of all.

Viewed from the summit of reason, all life looks like a malignant disease and the world like a madhouse.

I think we can all agree this is a very important election [2016]. We don't want to see Hillary Clinton become the president of the United States.

How you all will change the work after I am gone. If I came back a hundred years from now, I just wonder if I would even recognize it.

I'll sing as long as I can because I enjoy doing that. I enjoy the fans and what I do. I love the traveling and the hotels and just seeing the world over and over again.

If you are truly on the left, if you reject ideas of power and hierarchy, what you want is equality. Otherwise, it won't work at all.

I'm not living in the shadows anymore. I want to walk in the sun. But I can't do that without you.