There is an old illusion--it is called good and evil. Around soothsayers and astrologers hath hitherto revolved the orbit of this illusion.
Once did one BELIEVE in soothsayers and astrologers; and THEREFORE did one believe, "Everything is fate: thou shalt, for thou must!"
Then again did one distrust all soothsayers and astrologers; and THEREFORE did one believe, "Everything is freedom: thou canst, for thou willest!"
O my brethren, concerning the stars and the future there hath hitherto been only illusion, and not knowledge; and THEREFORE concerning good and evil there hath hitherto been only illusion and not knowledge!

"Thou shalt not rob! Thou shalt not slay!"-- such precepts were once called holy; before them did one bow the knee and the head, and take off one's shoes.
But I ask you: Where have there ever been better robbers and slayers in the world than such holy precepts?
Is there not even in all life -- robbing and slaying? And for such precepts to be called holy, was not TRUTH itself thereby -- slain?
-- Or was it a sermon of death that called holy what contradicted and dissuaded from life? -- O my brethren, break up, break up for me the old tables!

From Nietzsche’s ‘Thus Spoke Zarathustra’