To be incapable of taking one's enemies, one's accidents, even one's misdeeds seriously for very long—that is the sign of strong, full natures in whom there is an excess of the power to form, to mold, to recuperate and to forget[...] Such a man shakes off with a single shrug many vermin that eat deep into others; here alone genuine 'love of one's enemies' is possible—supposing it to be possible at all on earth. How much reverence has a noble man for his enemies!—and such reverence is a bridge to love.—For he desires his enemy for himself, as his mark of distinction; he can endure no other enemy than one in whom there is nothing to despise and very much to honor!

First Essay, Section 11 - On the Genealogy of Morality (1887)