Chris-
I call this passage 'The Christians Code of Conduct', because it not only identifies which actions, and more importantly which emotions, are in opposition to God's will, but also which emotions (the fruit of the Spirit0 we are to identify as the source of all that we say and do if our words and actions are to truly conform to what God wants of us:
So I say, live by the Spirit, and you will not gratify the desires of the sinful nature. For the sinful nature desires what is contrary to the Spirit, and the Spirit what is contrary to the sinful nature. They are in conflict with each other, so that you do not do what you want. But if you are led by the Spirit, you are not under law.
The acts of the sinful nature are obvious: sexual immorality, impurity and debauchery; idolatry and witchcraft; hatred, discord, jealousy, fits of rage, selfish ambition, dissensions, factions and envy; drunkenness, orgies and the like. I warn you, as I did before, that those who live like this will not inherit the kingdom of God.
But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self-control. Against such things there is no law. Those who belong to Christ Jesus have crucified the sinful nature with its passions and desires. Since we live by the Spirit, let us keep in step with the Spirit. Let us not become conceited, provoking and envying each other. (Galatians 5:16-26,NIV)
Don't worry about behaving in the way described here, because our success at living this life doesn't depend on our own willpower. Instead, it depends on our willingness to get out of the way and let God's Spirit take the lead.
Look at the first paragraph of this passage. Who's actually doing the fighting? It's the Spirit, not we ourselves. Our place is to be behind the Spirit, just as military formations of that era had men following those who were in the lead, but only engaging the enemy if those in front of them had already fallen. We can have the utmost confidence in the Spirit that he will never fall, so he will always be ahead of us. Our place in line is to stay behind him.
The second paragraph of this passage lists 'acts of the sinful nature'. But take a good look at that list, and count how many of those 'acts' aren't actions, but rather are the emotions which, if left unchecked, lead to the commission of sinful acts. Since emotions are at the very core of our being, we can't change them ourselves any more than a leopard can exchange his spots for the stripes of a tiger. But what we can't 'rein in', namely, our core emotions, the Spirit can. They're what he's engaging in battle in paragraph #1.
However, instead of simply subduing our natures and leaving it at that, the Spirit brings with him his 'fruit'. The nine emotions listed as 'the fruit of the Spirit' are to be our new natures as Christians. And just as the Spirit subdued our base natures, the Spirit instills in us our new natures. We are to see these nine emotions as the new core of our being, and accept that what we say and do as Christians are to have their point of origination in these emotions if they are to be seen as Christlike.
But remember this: Our sinful natures may be subdued, but they're not dead. Every so often you'll recognize an attempt by some part of that base nature to assert itself. When you do, relax. You wouldn't have recognized what the sinful nature was attempting to do if the Spirit weren't still with you, so let him put those 'assertions' back where they belong, while you continue to live your life recognizing that 'the fruit of the Spirit' is the border within which we are to remain.
God bless-