“Logic may be conceived as ruling out what is absolutely impossible, and thus determining the field of what in the absence of empirical knowledge is abstractly possible.”

“The true function of logic ... as applied to matters of experience ... is analytic rather than constructive; taken a priori, it shows the possibility of hitherto unsuspected alternatives more often than the impossibility of alternatives which seemed prima facie possible. Thus, while it liberates imagination as to what the world may be, it refuses to legislate as to what the world is”

“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.”

“He possessed the logic of all good intentions and a knowledge of all the tricks of his trade, and yet he never succeeded at anything, because he believed too much in the impossible. Surprising? Why so? He was forever in the act of conceiving it!”

“May peace rule the universe; may peace rule in kingdoms and empires; may peace rule in states and in the lands of the potentates; may peace rule in the house of friends and may peace also rule in the house of enemies.”

“Only stilted pedants can conceive the idea that there are absolute norms to tell what is beautiful and what is not. They try to derive from the works of the past a code of rules with which, as they fancy, the writers and artists of the future should comply. But the genius does not cooperate with the pundit.”