Amor fati: this is the very core of my being —And as to my prolonged illness, do I not owe much more to it than I owe to my health? To it I owe a higher kind of health, a sort of health which grows stronger under everything that does not actually kill it! —To it, I owe even my philosophy.… Only great suffering is the ultimate emancipator of spirit, for it teaches one that vast suspiciousness which makes an X out of every U, a genuine and proper X, i.e., the antepenultimate letter. Only great suffering; that great suffering, under which we seem to be over a fire of greenwood, the suffering that takes its time—forces us philosophers to descend into our nethermost depths, and to let go of all trustfulness, all good-nature, all whittling-down, all mildness, all mediocrity,—on which things we had formerly staked our humanity.
What Nietzche means in terms of X: "We obtain the concept, as we do the form, by overlooking what is individual and actual; whereas nature is acquainted with no forms and no concepts, and likewise with no species, but only with an X which remains inaccessible and undefinable for us." I therefore assume U is to understand, though do not know if that is the case. Nietzsche says it's more proper to know it is unknown than to assign a U. True. ↩︎
—Friedrich Nietzsche, Nietzsche contra Wagner, p. -1