Someone must teach the truth about moral purity in order to establish it in the lives of Christians. Doctrinal truth, the teaching of the word of God, is essential to righteous living. By taking heed thereto according to thy word. In other words, one will grow in holiness and will lay aside his former lusts only as he desires, imbibes, and ingests the teaching of the word of God. That is cited as a reason why we must earnestly contend for the faith.
Doctrinal impurity leads to moral corruption.
If the truth is not taught, if there is not rebuke, reproof, correction, and instruction in righteousness on what constitutes a marriage and home relationship as God would have it, churches will soon be filled with adulterous marriages. Such advise is a recipe for both doctrinal and moral corruption. It is a nice thought, but it will not work. Rest assured that there are those who are tired of fighting the battle we appear to be losing on the moral front. They are ready, not to attack the compromise and doctrinal softness that brings impiety and impurity, but they are ready to assail those who stand.