There's some good stuff in this video.
Leadership is all about creating an environment where other people can grow and thrive . . . even when doing so requires some sacrifice on the part of the leader.
As Mr. Sinek puts it, "If the conditions are wrong, we are forced to expend our own time and energy to protect ourselves from each other, and that inherently weakens the [group]. When we feel safe inside the [group], we will naturally combine our talents and our strengths and work tirelessly to face the dangers outside and seize the opportunities."