JL wrote M. Black once said that the whole Tractatus was "a joke", played on Witters's himself -- with a famous punchline: "Use my propositions as a ladder, and throw it after you climbed" (implicature: up the philosophical mountain of wisdom). *I wonder where Max Black said this, and where in the *Tractatus*, Wittgenstein mentions wisdom. Kind regards. Robert Paul Sometime student of Max Black's