I read this portion this morning during my devotions and it was very informative and very moving. I think it is worth posting here. Please take a care look at it - I think it will be a real blessing to you. It comes from Milton Vincent's A Gospel Primer.
Though saved, I am daily beset by a sinful flesh that always craves those things that are contrary to the Spirit. These fleshly lusts are vicious enemies, constantly waging war against the good of my soul. Yet they promise me fullness, and their promises are so deliciously sweet that I often find myself giving into them as if they were friends that have my best interests at heart.
On the most basic of levels, I desire fullness, and fleshly lusts seduce me by attaching themselves to this basic desire. They exploit the empty spaces in me, and they promise that fullness will be mine if I give in to their demands. When my soul sits empty and is aching for something to fill it, such deceptive promises are extremely difficult to resist.
Consequently, the key to mortifying fleshly lusts is to eliminate the emptiness within me and replace it with fullness; and I accomplish this by feasting on the gospel. Indeed, it is in the gospel that I experience a God who glorifies Himself by filling me with His fullness. He is the One, Paul says, "who fills all in all." He is the One who "fills all things" with the gifts He gives. And He lavishes gospel blessings upon me with the goal that I "be filled up to all the fullness of God." This is the God of the gospel, a God who is satisfied with nothing less than my experience of fullness in Him! The first command God spoke in the Garden was, "eat freely." And with similar insistence He says to me now, "be filled.
"What happens to my appetites for sin when I am filled with the fullness of God in Christ? Jesus provides this answer: "He who continually comes to Me will never hunger or thirst again." Indeed, as I perpetually feast on Christ and all of His blessings found in the gospel, I find that my hunger for sin diminishes and the lies of lust simply lose their appeal. Hence, to the degree that I am full, I am free. Eyes do not rove, nor do fleshly lusts rule, when the heart is fat with the love of Jesus!
Preaching the gospel to myself each day keeps before me the startling advocacy of God for my fullness, and it also serves as a means by which I feast anew on the fullness of provision that God has given to me in Christ. "Eating freely" of such provision keeps me occupied with God's blessings and also leaves me with a profoundly enjoyable sense of satisfaction in Jesus. And nothing so mortifies fleshly lusts like satisfaction in Him.