1. Boasting on the cross means that you are boasting while you are on the cross. So this means that we need to live for him and not and just him not anyone else.
2. We will die on earth but are sprits will live on forever in heaven so we are just dying on the earth "It is no longer I who live, but Christ who lives in me."
3. I think there are more areas in my life that i'm not living through faith than living. Like sports for instance I sometimes Im not always doing what God would like me to do such as use language or play rough and things. There are many areas i could work on with living my life fully for God.