Because no matter what you say in life, the truth will always be the truth. You know when someone is telling the truth, you look in the eyes. I have a tendency to believe people.
You have to feel confident. If you don't, then you're going to be hesitant and defensive, and there'll be a lot of things working against you.
When ambitious desires arise in thy heart, recall the days of extremity thou have passed through. Forbearance is the root of all quietness and assurance forever.