I am studying Dallas Willard's "The Great Omission" - he makes a very powerful statement
The body can acquire a "life of its own" - tendencies to behave without regard to our concious intentions. In our fallen world this life is prepossessed by evil, so that we do not have to think to do what is wrong, but we must think and plan and practice - and receive grace - if we are to succeed in doing what is right.
Romans 12:2 says, "Do not be conformed to this world, but be transformed by the renewal of your mind, that by testing you may discern what is the will of God, what is good and acceptable and perfect."
Paul's words to the Corinthians, "We have the mind of Christ." (1 Cor. 2:16).
Paul says to Colassae, "Set your mind on the things above, not on the things on the earth." (Col 3:2).
The "setting your mind" is one of the most critical elements to a godly walk. We have to make an active determination to think about the things in heaven. It is the key to walking with the Lord Jesus Christ in holiness.