OK, so Paul uses a bit of a tongue twister in today's reading to make his point. Let's have a look at verse 15, "I do not understand what I do. For what I want to do I do not do, but what I hate I do." Crystal clear, right?
I think what Paul is trying to say is that being a Christian is hard. Sin, the sin that tempts you or me, is attractive. By being Christians we all want to follow the teachings of Jesus Christ and want to become more like Him. However, we are all human and none of us is strong enough to resist sin by ourselves. We all must rely on Jesus to help us resist sin. So, let's take a closer look at what Paul means in verse 15.
"I do not understand what I do." Intellectually we, as Christians, know we are to live a life following the teachings of Jesus. So then why don't we? Why do some things tempt us so much? Why do we fall victim to the temptation some times? As Paul puts it, I do not understand why I cannot live a life totally modeled after Jesus. I do not understand why I sin.
"For what I want to do I do not do, but what I hate I do." Paul wants to live a life as close to Jesus' as possible. But as a human he cannot resist certain temptations by himself. Thus, what I want to do (live like Jesus) I do not do (as we fall victim to certain temptations and sin), and what I hate (sin) I do (we commit sin every time we let temptation over come us).
No one, not even Paul, can resist all sin by himself. Sure it is easy to resist sin that is not attractive or tempting to you, but all of us have some thing that is so attractive and so tempting that we cannot resist it alone. This is when we need to ask Jesus to help us resist the sin. With Jesus by our side resistance is not only possible, but much easier. When you are tempted by that very personally attractive sin, ask Jesus for the strength to resist. He will help you.
Wishing you the best in your walk with Christ,