Sin is one thing but instinctive reaction or passion is another. These are our reactions: pride, anger, sexual indulgence, hate, greed, and so on. The corresponding sins are the gratification of these passions: when a man acts and brings into corporeal reality those works which were suggested to him by his desires. It is impossible to exist without desires arising, but not to give way to them is by no means impossible.

Discourses and Sayings (ed. 1977)