Imagine trying to help someone out of a hole and they're fighting you to stay in it. They do not know what they are doing. Falling back into the hole they re-install their carnal nature, the old self is controlling them like a magnet, pulling their emotions and thoughts while magnifying feelings of hopelessness. The devil wants to enslave them in sin and seduce them into seeing things his way. When you see things with the carnal mind you look at life with the eyes of the devil.
Sin is like leaven it works in darkness.
It lies in the subconscious mind will grow and multiply. Satan will fight like a lion to keep someone from being born again. He loves for Christians to take a half-hearted approach toward evangelism. The new birth is a wonderful experience. In order to be born again self must die.