You might have heard the comment, ‘There’s a black dog and a white dog in your life and depending on which one you feed, will determine which one wins the battle.’ Nice thought. Problem is it’s not the bible. This philosophy reflects more of eastern mysticism (Yin & Yang) than Christianity.
Dualism is a theory that the world consists of 2 opposing fundamental entities and is not consistent with Christianity. Christianity is Christ-centric, not two equal opposing adversaries. Unfortunately a dualistic mindset has crept into the church over the centuries and has duped Christians into believing that after we are born again we have two natures at war within us – a Sinful Nature and a Divine Nature.
Romans 6 and 7 teaches, however, that once we are saved, we are dead to sin and alive to God. We have been crucified with Christ. It is no longer I who live but Christ who lives in me. After we are born again our spirit which was dead in sin, comes alive in Christ Jesus and our sinful nature is erased. In Christ Jesus we are new creations, the old has gone, the new has come and we are now partakers of a divine nature. However, our minds have a memory of our old nature that needs to be reprogrammed and renewed to think according to the divine nature we have received.
What makes us vulnerable to sin and spiritual attack is not a sinful nature because that’s been done away with, but our un-renewed mind and spiritual lethargy. These two have a massive bearing upon our response to temptation. When the external fiery darts of Satan come our way, we have a choice, do we exercise our shield of faith or do we partner with the temptation and rebel against God. If we as believers do sin, it’s because we are exercising our will to do so in disobedience and rebellion against God, just as Adam and Eve did in the garden of Eden, whilst having a divine nature pre-fall (Genesis 3).
The mind truly is a battlefield and needs to be reprogrammed and renewed because it has a living memory of old patterns of thinking and acting. That’s why Romans 12:2 says, ‘Don’t be conformed to the pattern of this world but be transformed by the renewing of your mind.’
Christianity is not dualistic. It’s Christ-centric. There are not two equal opposing forces at war within you. You have been born again. Your spirit has come alive with a divine nature and now begins the process of being transformed in your patterns of thinking to think like God thinks, according to your divine nature in Christ.