"We have a government that borrows $4 billion a day. We have a government that owes trillions of dollars in debt, half of that to foreigners, most of that to Chinese investors. I don't - that is extreme. Not only is it extreme. It's insane and it's unsustainable."

"Experience is the stern teacher that gives the examination before the lesson. Such is the immutable nature of understanding."

"I don't really like labels in politics, but I will gladly accept the label of conservatism."

"It's not in our nature. Americans have never been a people that drive through a nice neighborhood and say, 'Oh, I hate the people who live in these nice houses.'"

"In scientific work, those who refuse to go beyond fact rarely get as far as fact."

"I don't think my work does reflect my nationality - I don't like the idea of nationalism."

"The humanists' replacement for religion: work really hard and somehow you'll either save yourself or you'll be immortal. Of course, that's a total joke, and our progress is nothing. There may be progress in technology but there's no ethical progress whatsoever."

"My country has contrived for me the most insignificant office that ever the invention of man contrived or his imagination conceived."