"Nothing is great but truth, and the smallest truth is great. The other day I had a thought, which I put like this: Even a harmful truth is useful, for it can be harmful only for the moment and will lead to other truths, which must always become useful, very much so. Conversely, even a useful error is harmful, for it can be useful only for the moment, enticing us into other errors, which become more and more harmful."

"The subversive character of truth inflicts upon thought an imperative quality. Logic centers on judgments which are, as demonstrative propositions, imperatives, — the predicative “is” implies an “ough…"

"We want philosophers, among other reasons, because the world is full of false philosophy. The way of experience is beset on every hand by a multitude of verbal judgments, of empty phrases, of word-cop…"

"If I were making a world and could arrange it as I wanted to, only humanitarians would be allowed to practice vivisection. Only those would be allowed to practice it who would be as economical in infl…"

"Our poor friend Sisley, alas! will not assist at the final triumph, which is near, and of which he has seen but the dawning : he is gone too soon, and just at the moment when, in reparation for long i…"