Boundaries:

Quintus Curtius:

"One of the great themes of classical tragedy is this idea of man crossing boundaries that were not meant to be crossed, and thereby incurring the wrath of the gods. 

You see this theme over and over again in the great tragedians of antiquity."

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Quintus Curtius on Trust:

"If you are afraid to show emotion, humor, intensity, imperfections, flaws, etc: then no one is going to trust you. 

Some of you ... never take off your masks. You've been wearing them for so long, you don't even know yourself who you are."