When team members do not openly debate and disagree about important ideas, they often turn to back channel personal attacks, which are far nastier an… - Patrick Lencioni

The kind of trust that is necessary to build a great team is what I call vulnerability-based trust. This is what happens when members get to a point where they are completely comfortable being transparent, honest, and naked with one another, where they say and genuinely mean things like "I screwed up," "I need help," "Your idea is better than mine," "I wish I could learn to do that as well as you do," and even, "I'm sorry." When everyone on a team knows that everyone else is vulnerable enough to say and mean those things, and that no one is going to hide his or her weaknesses or mistakes, they develop a deep and uncommon sense of trust. They speak more freely and fearlessly with one another and don't waste time and energy putting on airs or pretending to be someone they're not. Over time, this creates a bond that exceeds what many people ever experience in their lives and,

More than any policy or system, there is nothing like the fear of letting down respected teammates that motivates people to improve their performance.

Trust is knowing that when a team member does push you, they're doing it because they care about the team.