the fight

'Those who live according to the sinful nature have their minds set on what that nature desires; but those who live in accordance with the Spirit have their minds set on what the Spirit desires. The mind of sinful man is death, but the mind controlled by the Spirit is life and peace.'
Romans 8:5

"The Holy Spirit creates desires in us and sin creates desires in us. We can choose to focus our minds on one or the other. If we want to walk more closely with the Holy Spirit, then we will set about desiring what the Spirit desires and denying what our sinful nature desires in all the decisions of the day.
The Spirit is within us and desires to obey God. We could not experience this new desire before we became Christians. All we knew was a strong desire to disobey, even if we dressed it up in an outwards show of morality. Now we have a strong desire to obey. The Spirit achieves the goal of the law in us (something the law itself could never do) by changing us, not with an external list, but by transforming our hearts and attitudes.
We are changed from the inside out. God has transformed, and is transforming, our desires. The Spirit gives power over sin in the Christian life."
Marcus Honeysett, 'Finding Joy', IVP

"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."
Galatians 5:16-18

Thanks Marcus
Praise be to Father, Son, and Holy Spirit!