“We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard.”

“When someone shows you who they are, believe them the first time.”

“The true method of knowledge is experiment.”

“Judgments, value judgments concerning life, for or against, can in the last resort never be true: they possess value only as symptoms, they come into consideration only as symptoms - in themselves such judgments are stupidities.”

“There are worse crimes than burning books. One of them is not reading them.”

“Work alone is noble.”