“Every concept arises from the equating of unequal [or dissimilar] things” (Nietzsche, unknown).
“There are no facts, only interpretations” (Nietzsche, Notebooks: Summer 1886 – Fall 1887).
“The surest way to corrupt a youth is to instruct him to hold in higher esteem those who think alike than those who think differently” (Nietzsche, The Dawn, Sec. 297).
“He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you” (Nietzsche, “Beyond Good and Evil”, Aphorism 146 (1886)).