Stillness Is the Key by Ryan Holiday

also learned that he could count on himself and that he could get
through it—if he kept his head. Whatever happened, he told himself
early in the crisis, no one would write The Guns of October about his
handling of it. That was something he could control, and so in that he
found confidence.
This is key. Both egotistical and insecure people make their flaws
central to their identity—either by covering them up or by brooding
over them or externalizing them. For them stillness is impossible,
because stillness can only be rooted in strength.
That’s what we have to focus on.
Don’t feed insecurity. Don’t feed delusions of grandeur.
Both are obstacles to stillness.
Be confident. You’ve earned it.