In the kynicism of Diogenes of Sinope, the laughter about philosophy itself became philosophical. … In the pantomimes and wordplays of the philosopher from the tub, the Gay Science was born, which saw the earnestness of the false life recur in the false earnestness of philosophy.

p. 535 - Kritik der zynischen Vernunft [Critique of Cynical Reason] (1983)