— Friedrich Nietzsche German philosopher, poet, composer, cultural critic, and classical philologist 1844 - 1900
Context: You have committed one of the greatest stupidities — for yourself and for me! Your association with an anti-Semitic chief expresses a foreignness to my whole way of life which fills me again and again with ire or melancholy. … It is a matter of honor with me to be absolutely clean and unequivocal in relation to anti-Semitism, namely, opposed to it, as I am in my writings. I have recently been persecuted with letters and Anti-Semitic Correspondence Sheets. My disgust with this party (which would like the benefit of my name only too well!) is as pronounced as possible, but the relation to Förster, as well as the aftereffects of my former publisher, the anti-Semitic Schmeitzner, always brings the adherents of this disagreeable party back to the idea that I must belong to them after all. … It arouses mistrust against my character, as if publicly I condemned something which I have favored secretly — and that I am unable to do anything against it, that the name of Zarathustra is used in every Anti-Semitic Correspondence Sheet, has almost made me sick several times.
Objecting to his sister Elisabeth, about her marriage to the anti-semite Bernhard Förster, in a Christmas letter (1887) http://www.geocities.com/thenietzschechannel/nlett1887.htm in Friedrich Nietzsche's Collected Letters, Vol. V, #479