"The mind of your own enemy, the pupil, is working away from you, as keenly and eagerly as is the mind of the commander on the other side from the scientific general. Just what the respective enemies want and think, and what they know or do not know, are as hard things for the teachers as for the general to find out."

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Anyone living, especially your peers, is a threat. You're judging them, they're judging you. This sort of criticism is as close to human nature as you can get. That can be a good thing sometimes. Jealously, rancor, competition, those can be good things in art. But it mostly puts you in a dangerous and disadvantageous position, and one that just takes away from you so much.

— Raymond Pettibon