"But ye have not so learned Christ; If so be that ye have heard him, and have been taught by him, as the truth is in Jesus: That ye put off concerning the former conversation the old man, which is corrupt according to the deceitful lusts; And be renewed in the spirit of your mind; And that ye put on the new man, which after God is created in righteousness and true holiness." (Ephesians 4:20-24)
The comments in "Biblical Perspectives" notes that verses twenty-one through twenty-four show the contrast in beliefs and lifestyle of the Christian and the unbeliever.
Exercise: List the various contrasts, putting them in your own words to make the meaning clearer.