I just finished reading this book.

Amazing.

From Still Life With Woodpecker:

"Inessential insanities are a brittle amalgamation of ambition, aggression, and pre-adolescent anxiety- garbage that should have been dumped long ago. Essential insanities are those impulses one instinctively senses are virtuous and correct, even though peers may regard them as coo coo. Inessential insanities get one in trouble with oneself. Essential insanities get one in trouble with others. Its always preferable to be in trouble with others. In fact, it may be essential."