You shall live so that you can withstand in the face of madness when I comes. And you shall not  flee insanity. It is luck when it isn’t there, but  flee it you shall not.

Insanity … is the most severe judge (the most severe court) of whether my life is right or wrong.

But madness does not sully reason. Even though it does not guard it.

Respect of madness – that is really all I am saying.

Assorted remarks from Wittgenstein's Diaries