What does it mean to live "according to the flesh"? Verse 13 says "For if you live according to the flesh, you will die; but if by the Spirit you put to death the misdeeds of the body, you will live." We all have a sinful nature. We are tempted to do that which is displeasing to God. How do we handle our temptations? Do we allow our flesh to rule over us? The Bible tells us in 1 Peter 5:8 that our enemy is looking to devour us like a hungry lion; James 4:7 tells us to resist the devil and he will leave us alone.
The good news is that God IS for us. He always will be. We are not only conquerors, we are MORE than conquerors. So if you see a fellow believer that is struggling, take time to encourage them. Remind them that nothing can separate us from the love of God. We are the family of God. Let's treat each other like family.