Roger Zelazny said this quote

“ You were correct, for all men have within them both that which is dark and that which is light. A man is a thing of many divisions, not a pure, clear flame such as you once were. His intellect often wars with his emotions, his will with his desires . . . his ideals are at odds with his environment, and if he follows them, he knows keenly the loss of that which was old, but if he does not follow them, he feels the pain of having forsaken a new and noble dream. Whatever he does represents both a gain and a loss, an arrival and a departure. Always he mourns that which is gone and fears some part of that which is new. Reason opposes tradition. Emotions oppose the restrictions his fellow men lay upon him. Always, from the friction of these things, there arises the thing you called the curse of man and mocked; guilt! ”