Mary Astell

The design of Rhetoric is to remove those Prejudices that lie in the way of Truth, to Reduce the Passions to the Government of Reasons; to place our Subject in a Right Light, and excite our Hearers to a due consideration of it.

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.