Thomas Piketty

He has willed - He wills incessantly - that the modifications of the mind and those of the body shall be reciprocal. This is the conjunction and the natural dependence of the two parts of which we are constituted.

Many of Judy Blume's books - which I devoured when I was growing up and where I found characters that were believable because they were a lot like me - caused considerable consternation when they were first published, but now they're widely accepted as an essential part of the children's literary canon.