"The eternal return transmutes the negative: it turns the heavy into something light, it makes the negative cross over into affirmation, it makes negation a power of affirming."

Nietzsche and Philosophy, p. 81.

Good new book on Deleuze

http://www.amazon.com/Gilles-Deleuze-Fabulation-Philosophy-Powers/dp/0816665508/ref=sr_1_1?s=books&ie=UTF8&qid=1325002129&sr=1-1