"I say then, Walk in the Spirit, and you shall not fulfill the lust of the flesh." (Galatians 5:16)
The reason some Christians find themselves struggling with the flesh is that they're not living the Word.
"But be doers of the word, and not hearers only, deceiving yourselves."
The Word of God is clear: walk in the Spirit, and you won't be feeding the desires of your flesh, as our opening verse states.
Some have been trying to crucify the flesh for a long time and haven't gotten anywhere. God never told us to crucify the flesh because it's already been crucified-- it happened the moment you were born again.
"And those who are Christ’s have crucified the flesh with its passions and desires."
So if you've been struggling with the flesh, simply stop. Just act on the Word! Walk according to the life and nature of God that's in your spirit. The Bible tells us to walk in the light, as He is in the light (1 John 1:17); in other words, walk in the light of God's provisions for you in Christ, as revealed in the Word.
"For sin shall not have dominion over you, for you are not under law but under grace."
If you find yourself struggling with a sinful habit, don't become frustrated-- use the Word! Say this: "I'm the righteousness of God in Christ Jesus. Sin has no power over me! I refuse to be entangled by any yoke of bondage. I put a stop to this habit, in Jesus' Name." Make this declaration and begin to walk in its light, and sin won't have any rule over you. Hallelujah!
Prayer: Dear Father, I thank You for enlightening me on the path of life through Your Word. Your Word is light and full of glory. I walk in the light of my righteousness, exercising dominion over Satan, sin, and the flesh with all its affections and lusts. I've overcome the world, and I live triumphantly every day, in Jesus' Name. Amen.
Further Study: Hebrew 12:1; Romans 6:14-18