As water reflects a face,
so a man's heart reflects the man.
Someone once said, "You spill what you are filled with." One of the things Christians are called upon to do is to die daily to our desires. That is not hard... apart from the Lord's work in the heart... it is impossible.
Here is a simple question every believer should ask of him or her self: Do I reflect the character of Christ more and more in my life?
If the answer is "No.", then you may want to spend some time at the feet of Jesus learning what it means to "be conformed to His image" (Romans 8:28 - 30)