Galatians 5:17-18

For the flesh desires what is contrary to the Spirit, and the Spirit what is contrary to the flesh. They are in conflict with each other, so that you are not to do whatever you want. But if you are led by the Spirit, you are not under the law. 

For the flesh desires what is contrary to the Spirit, and the Spirit what is contrary to the flesh 
Romans 8:5-8  Those who live according to the flesh have their minds set on what the flesh desires; but those who live in accordance with the Spirit have their minds set on what the Spirit desires. The mind governed by the flesh is death, but the mind governed by the Spirit is life and peace. The mind governed by the flesh is hostile to God; it does not submit to God's law, nor can it do so. Those who are in the realm of the flesh cannot please God.

They are in conflict with each other, so that you are not to do whatever you want 
Romans 7:15  I do not understand what I do. For what I want to do I do not do, but what I hate I do.
Romans 7:21-23  So I find this law at work: Although I want to do good, evil is right there with me. For in my inner being I delight in God's law; but I see another law at work in me, waging war against the law of my mind and making me a prisoner of the law of sin at work within me.

But if you are led by the Spirit 
Galatians 5:16  So I say, walk by the Spirit, and you will not gratify the desires of the flesh.

you are not under the law 
Romans 2:12  All who sin apart from the law will also perish apart from the law, and all who sin under the law will be judged by the law.
1 Timothy 1:9-11  We also know that the law is made not for the righteous but for lawbreakers and rebels, the ungodly and sinful, the unholy and irreligious, for those who kill their fathers or mothers, for murderers, for the sexually immoral, for those practicing homosexuality, for slave traders and liars and perjurers--and for whatever else is contrary to the sound doctrine that conforms to the gospel concerning the glory of the blessed God, which he entrusted to me.

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide. 
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