How great leaders inspire action, overall

How great leaders inspire action, overall
Summary
When people do something, their actions are described by using "what," "how," and "why."
However, "what," and "how,"  don't drive their behavior. 
When they want to do something heartily and they have something they believe, they start doing it. They understand why they do.
If something they believe attract someone and it achieve a tipping point, it will suddenly spread.
This is the power that can inspire people. Great leaders have it that inspires them.