Beyond Good and Evil is a book by a philosopher, Friedrich Nietzsche. It takes up and expands on the ideas of his previous work, Thus Spoke Zarathustra, but approached from a more critical, polemical direction.
In Beyond Good and Evil, Nietzsche attacks past philosophers for their alleged lack of critical sense and their blind acceptance of Christian premises in their consideration of morality. The work moves into the realm "beyond good and evil" in the sense of leaving behind the traditional morality which Nietzsche subjects to a destructive critique in favour of what he regards as an affirmative approach that fearlessly confronts the perspectival nature of knowledge and the perilous condition of the modern individual.