So letting your sinful nature control your mind leads to death. But letting the Spirit control your mind leads to life and peace.
Well, first off we need to understand that when Paul is talking about death and life he is not talking only about our life on earth. He is talking about our eternity, hell and heaven. If you let the sinful nature control your mind, then you will fall into sin which leads to death. However if you let the Holy Spirit renew your mind and be the one that makes the decisions this will lead you to eternal life. Let your mind be renewed by the Holy Spirit. So, how do you know if you are letting your sinful nature control your mind? Well, if a thought comes into your mind and you know that you shouldn’t be thinking that, but still you enjoy it and keep thinking about it then you are letting the sinful nature control your mind. However, if the Holy Spirit is controlling your mind then whenever a bad thought comes into your mind you will reject it and start thinking of good things (holy things). The Bible says that if anything that is good, pure, holy… think about these things. Therefore, don’t let satan take a lead, every time something bad goes through your mind reject it and ask the Holy Spirit to control your mind and think about heavenly things. Keep fighting the good battle and persevere. God bless you all