Ephesians 4:17-32.

Now that the saints in Ephesus are in Christ Jesus they are to not only walk in unity, but they are to also walk in purity. Their life before Christ reflected the walk and talk of a God-less pursuit of impurity. But now that Ephesians 1-3 is true of them [ and us for that matter ] we must no longer live like we used to live as non-Christians. In this walk of purity our mind matters as we put off the old self and put on the new self with minds renewed by the Word and the Spirit.