 How do you fight sin? How do you keep sin at bay? Paul says make no provision for the flesh. If you struggle with let's say lust, well then what you can do is on your phone make sure you dislike or I'm not interested in any of these videos, any of these shorts, anything showing or exposing someone of the opposite sex in a sexual position. Make sure that you don't buy condoms just in case. Make sure you don't listen to certain songs. As a matter of fact, delete certain songs off your playlist. Make sure that you unsubscribe or stop having certain streaming software. Something like Netflix or what have you that may bring something to your eyes, to your ears. Make sure that you don't go around certain people. Make sure you don't go to certain places. Make no provision for the flesh means make sure that where you go, where you see, where what you hear doesn't entice your flesh. Eliminate that. I promise you you're not going to miss out on anything, but what you will gain is freedom, joy, and a closer relationship with Christ.