Of these things put them in remembrance
Meaning either his hearers, or those to whom he was to commit the things he had heard of the apostle, and who must expect to suffer afflictions, and endure hardships, for the sake of Christ, and his Gospel; wherefore to remind them of the above sayings might be of use and comfort to them. This clause is wanting in the Arabic version.
that they strive not about words;
it became them to strive and contend for the form of sound words, for the wholesome words or doctrines of our Lord Jesus, but not about mere words, and especially such as were
to no profit;
to no advantage to truth, nor to themselves nor others; were not to edification, to spiritual edification, to godly edifying, which is in faith:
but to the subverting of the hearers;
the confounding of their minds, misleading their judgments, and overthrowing their faith; and therefore were not only unprofitable, but hurtful and pernicious, and by all means to be avoided.