Just because we have been born again of the Holy Spirit, doesn't negate the fact that we still carry the baggage of our fleshly nature with us, as explained by Paul's struggles in Romans 7:18-25. After we have been born again, our choices are influenced either by the flesh or by the Spirit, and many times, as for myself, I am afraid that my fleshly nature wins out. There is a saying that I have heard about the earlier native Indians saying; There is a white dog and a black dog within them that fight against one another, and the one that wins, is the one that they feed the most.