If anyone teaches a different doctrine, and doesn't consent to sound words, the words of our Lord Jesus Christ, and to the doctrine which is according to godliness,
It is not uncommon to find Paul warning against false teaching. His warnings in this context include his prior teaching regarding the master-servant relationship, but his admonition--as is common with Paul--takes on a more general nature. Paul recapitulates what he had touched on in the opening of the epistle: warnings against error in teaching. It was because of such teaching, in fact, that Paul urged Timothy to stay in Ephesus (1 Timothy 1:3). (See 2 Corinthians 11:4 and Galatians 1:6).