I'm not sure that you are...

Insanity in the context of this quote is not mental disease.

To me, insanity refers to a judgment of the rationality of an observed behavior.

Who is to say whether an exhibited mode of behavior deemed by the observer to be irrational is the product of a mental disease or the rational course of action given a more complete understanding of the world?

Thanks for this delightful and helpful comment. I'm very glad to hear it.