Beyond Good and Evil: Prelude to a Philosophy of the Future (Version 2) by Friedrich Nietzsche (1844

By turns illuminating, infuriating, bewildering, and amusing, Nietzsche's masterwork covers a lot of ground. He rejects most strands of Western thought, especially on the subject of morality, and develops his own theme demanding that individuals embrace their own 'will to power' to give life intention and direction. First published in German in 1887, this translation was produced in 1907 by Helen Zimmern, a long-standing acquaintance of Nietzsche.

There is an accessible text at http://www.gutenberg.org/ebooks/4363 but it leaves out all words in Greek, and is not in alignment with any printed edition; hence using the archive.org version. - Summary by Cori Samuel