You can never be free until you develop the mental strength to stop fretting over things you cannot control.
I have so much respect for people in the service. The mental strength it takes to do what they do is unbelievable.
I should say that mental strength is No. 1, experience [is] No. 2, physical strength is No. 3, and genetic ability that you're getting from Mother Nature probably comes after.
To create something you must be something.
Mental strength is what separates champions from near champions.
