V.15 Here we have another comparison. Timothy is like a workman. If he faithfully and rightly divides the truth, he will not need to be ashamed of his work. Let us also “rightly divide” or interpret Scripture in its proper way. We will be able if we have a good conscience.
V.19 Notice two things (1) God’s side, the Lord knows who are believers. (2) Our side our responsibility is to separate from evil (evil teaching —v. 18; immorality — v. 22).
V.20 Some of us live in so-called Christian lands, but “Christian” in name only. “Great house” describes the mixture and includes those who say they are “Christians” but are not true believers in the Lord Jesus Christ. “Professors,” but not “possessors!”
V.21 What a wonderful promise is made here to the individual who does separate from teachings which Scripture condemns. That person will find himself (herself) understanding more truth quickly by the Holy Spirit of God (1 Thess. 2:13).
V.22 Four things. Righteousness; we learn from Matthew’s Gospel; Faith, from Mark’s; Charity (love) from John’s and Peace from Luke’s Gospel.
V.23-26 Warnings, red-lights that we’re not to go through,