The bolded is actually what my title on here ("vincit qui se vincit") addresses. "He who conquers himself, conquers (all)" -- or, conquering the inner self empowers you to conquer things in your external world. It's something I'm getting tattooed on the arm that I used to self-mutilate on when I was a teenager surrounded by abuse and dealing with undiagnosed chemical depression. It's so, so, so vital to know it's necessary to confront the internal to control the external. (To me, the tattoo symbolizes having the capacity to control my experiences and never again experience the abuse, overcome the damages, and all of the things that made me self-mutilate...by facing my inner world first and foremost. Establishing healthy boundaries, identifying things I need to identify, and so on. "Life doesn't have to be that way, and I can reign over my own life," basically.)
I'm curious as to what ways you are applying it specifically, what you are learning, what you are confronting/addressing or learning to control. That seemingly simple sentence is applicable to so many different things in so many different ways, and there is a lot of wisdom to be gained from its application in daily life.