--Mary Wollstonecraft, A Vindication of the Rights of Woman, 1792
...reading this sort of thing is part of why I'm really enjoying my Philosophy class. I guess Otherkin aren't such a new concept after all.
Incidentally, I disagree with the actual point of the paragraph, but that passage seemed rather... relevant, somehow.
edit: http://www.gutenberg.org/etext/3420 has the full text of the book, for the curious.