As we grow and mature in the Lord, we become more Christlike. We “reflect” His attitudes and we show His working in our lives. As the lesser light of the moon is just a reflection of the greater light of the sun, so we only reflect the image of the Son. Therefore, to become more Christlike is simply to conform our lives, our attitudes, and our minds to Him.
"And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God."