If people think you are crazy they won’t take you seriously. What we are dealing with on the inside isn’t always best reflected on the outside. This is an area that must be in balance with the world we live in.
Slim Shady nailed it “He’s nervous, but on the surface he looks calm and ready.”
Think about someone you know who is over the top externally, is it hard to take them seriously? Being in control of our emotional responses and our outward appearance is an important aspect of how others perceive us.