The Bible often uses the term flesh to illustrate what Jesus strongly warned against: “the spirit is willing but the flesh is weak.” Here the term flesh is used to describe that part of our nature which stands in contrast to our spirit. It is the carnal nature of man, the root of our sinful passions.
       Our flesh encompasses body, mind and soul—that part of us which is able to function without ever submitting to God. It’s very important to understand that the flesh follows us into our new life in God. It continues to have a life of its own, even as our spirit made alive.
       Regardless of the fact that we’re now focused on the desire of the Spirit, we find ourselves constantly embroiled in a battle with the desires of our flesh, as Paul so emphatically states in Galatians 5:17. Thank God there’s help!

From Free from the Power of Sin: the Keys to Growing in God in Spite of Yourself

The step of faith is one of immense proportions. It bridges the superficial nod of the intellect to the true belief of the heart. I was once seated next to a guy who had not asked Christ into His life yet accepted the fact that God did indeed exist. We got into a prolonged discussion about Jesus but came to no conclusion as to what he might do about taking that big step.
        Finally I asked the critical question: “Are you willing to ask Jesus to reveal Himself to you? And if He does, would you be willing to give your life to Him? His answer? “No!” I appreciated his brutal honesty. He knew something really significant was required on his part. That’s why his answer had to be “no.” It was the price he was unwilling to pay. It was the fear of giving up control of his life.

From: The Path through the Maze—Answering Life’s Ultimate Question: What Happens After We Die?

Surrendering your life is a step of profound obedience. Since God is well aware of every detail of your life, He knows what a huge commitment this is on your part. Take comfort in the fact that God designed it this way and therefore has made every provision for becoming reunited with Him—in spite of the inborn weakness of your humanity. There’s no need to worry. Being “born again” into this new life in Christ can happen in an instant of time for the heart that’s ready to receive Him.
       At the same time the Bible instructs those who have already taken that step to: “Test yourselves, to see if you are in the faith; examine yourselves! Do you recognize that Jesus Christ is in you—or do you fail the test?” You’ll find this practice useful in judging your spiritual condition no matter where you are along life’s path.

From: The Path through the Maze—Answering Life’s Ultimate Question: What Happens After We Die?