Alfred De Vigny said this quote

We have also set up for them an edifying project for a continuous mitigation of their own tyranny, ascribing to them an unshakeable faith in the triumph of virtue, as well as in the moral justification of their crimes. These are the theories of well-meaning children who see everything in black or white, dream of nothing but angels or demons, and have no idea of the incredible number of hypocritical masks of every color and shape and size which men use to conceal their features when they have passed the age of devotion to ideals and have abandoned themselves unrestrainedly to their egotistic desires