Lasting Significance
Wittgenstein’s Lasting Significance, edited by Max Kölbel and Bernhard Weiss, published by Routledge, 2004–
Page 168:
“Wittgenstein told Norman Malcolm that ‘a serious and good philosophical work could be written that would consist entirely of jokes (without being facetious)’ (Malcolm 1999: 64).”
Malcolm, N. (1999) “Wittgenstein: A Memoir,” in F.A. Flowers (ed.) Portraits of Wittgenstein, vol. 3, Bristol: Thoemmes Press, pp. 60-112
The lasting significance here is perhaps in the page numbers.