Our Flesh is a Monster

The flesh always opposes the spirit and vice versa. The more we feed our flesh, the more it will grow like a monster and hunger for carnal things. When you stop feeding it, it will bother you because it's hungry. Resist long enough and eventually the monster will starve to death. Many who struggle addiction and sin may just need to hold out longer and not cave in to temptation (James 4:7) and feed their spirit instead.

Our spirit works the same way, the more we feed it, the more it will grow and we will hunger for spiritual things. Furthermore when we sow according to the spirit we will reap spiritual blessings, most important of which is eternal life (Galatians 6:8). Jesus said my food is to do the will of my Father for good reason (John 4:34).

This is important because many believers who are still living according to their flesh are putting their eternities at stake. Romans 8:1 (KJV) says:

There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.

We have to become a people that live according to the Spirit in order to escape condemnation. John 3:36 as well as many other scripture echoes this:

Whoever believes in the Son has eternal life; whoever does not obey the Son shall not see life, but the wrath of God remains on him.