“There are certain questions that scientists may not ask, or, more accurately, for some questions, there are certain answers that scientists must a priori preclude from consideration.”

“The scientist is not a person who gives the right answers, he's one who asks the right questions.”

“The more you ask certain questions, the more dangerous they become.”

“Ask a true scientist a very profound question on his science, and he will besilent. Ask a true religious person a very simple question on his religion, and he will be frenzied.”

“Adults discourage children from asking philosophical questions, first by being patronizing to them and then by directing their inquiring minds towards more "useful" questions. Most adults aren't themselves interested in philosophical questions. They may be threatened by some of them. Moreover, it doesn't occur to most adults that there are questions that a child can ask that they can't provide a definitive answer to and that aren't answered in a standard dictionary or encyclopedia either.”

“Look at the language. If a scientist delivers the simple, unconditional, absolutely certain statements that politicians and journalists want, he is talking as an activist, not a scientist.”