We all carry the original sin. The urge to sin is always there and we are vulnerable to all kinds of temptations. I see that the only way to safeguard our soul is to follow Christ singularly. When we are filled or become one with the Lord, there is just no room for anything else anymore. We do not fundamental change, as without him, we easily revert to sinning again. It'll be like this before we enter heaven. So let the Lord "transform" us by letting him occupy us and shield us from all evil. And this calls for our complete surrender to him first.