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No quality or characteristic is more important than trust. People who aren't afraid to admit the truth about themselves are not going to engage in the kind of political behavior that wastes everyone's time and energy.
Vulnerability-based trust is so rare is that it is just plain hard to achieve, even when teams understand the definition. That's because human beings, especially the adult variety, have this crazy desire for self-preservation. The key ingredient to building trust is not time, it is courage.