Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it.

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.

Nakajima's presence didn't put any pressure on me, either. Quite the opposite: there was a warmth in the core of my chest when he was around.

Battles waged in daylight are fought by soldiers. Battles waged at night are fought by savages.

A dog might feel as majestic as a lion, might bark as loud as a roar, might have a heart as mighty and brave as a Lion's heart, But at the end of the day, a dog is a dog and a lion is a lion.

Learn as much by writing as by reading.

I'm afraid that sometimes you'll play lonely games too. Games you can't win 'cause you'll play against you.

There are few positions in life in which difficulties have not to be encountered. These difficulties are, however, our best instructors, as our mistakes often form our best experience.

Only mystery allows us to live, only mystery.

Either one does not dream, or one does so interestingly. One should learn to spend one's waking life in the same way: not at all, or interestingly.

One big theme for me is that we have got to move from an economy built on debt to one where we save and invest in the future.

I think that Rodney Stark studies of new religious movements in the modern world give us some insights into the kinds of questions that we can ask about early Christianity.