“Science may set limits to knowledge, but should not set limits to imagination.”

“...the supply of uranium in the planet is very limited, and it is feared that it may be used up before the human race is exterminated, but if the practically unlimited supply of hydrogen in the sea could be utilized there would be considerable reason to hope that homo sapiens might put an end to himself, to the great advantage of the other less ferocious animals.”

“The Church no longer contends that knowledge is in itself sinful, though it did so in its palmy days; but the acquisition of knowledge, even though not sinful, is dangerous, since it may lead to pride of intellect, and hence to a questioning of the Christian dogma.”

“Dogmatism and skepticism are both, in a sense, absolute philosophies; one is certain of knowing, the other of not knowing. What philosophy should dissipate is certainty, whether of knowledge or ignorance.”

“What we firmly believe, if it is true, is called knowledge, provided it is either intuitive or inferred (logically or psychologically) from intuitive knowledge from which it follows logically. What we firmly believe, if it is not true, is called error. What we firmly believe, if it is neither knowledge nor error, and also what we believe hesitatingly, because it is, or is derived from, something which has not the highest degree of self-evidence, may be called probable opinion. Thus the greater part of what would commonly pass as knowledge is more or less probable opinion.”

“In science, an observer states his results along with the “probable error”; but who ever heard of a theologian or a politician stating the probable error in his dogmas, or even admitting that any error is conceivable? That is because in science, where we approach nearest to real knowledge, a man can safely rely on the strength of his case, whereas, where nothing is known, blatant assertion and hypnotism are the usual ways of causing others to share our beliefs. If the fundamentalist thought they had a good case against evolution, they would not make the teaching of it illegal.”

“One obvious palliative of the evils of democracy in its present form would be to encourage much more publicity and initiative on the part of civil servants. They ought to have the right, and, on occasion, the duty, to frame Bills in their own names, and set forth publicly the arguments in their favor.”