1 Timothy 6:5

5Of men corrupt in understanding, and that are destitute of the truth It is certain that here he censures the sophists, who, neglecting edification, turn the word of God into trivial distinctions, and an art of ingenious discussion. If the Apostle only shewed that the doctrine of salvation is thus rendered useless, even that would be an intolerable profanation; but far heavier and fiercer is that reproof, when he says that evils so pernicious, and plagues so hurtful, spring from it. From this passage, therefore, let us learn to detest ( σοφιστικὴν) sophistry as a thing more destructive to the Church of God than can easily be believed.

That godliness is gain The meaning is, that godliness is a gainful art; that is, because they measure the whole of Christianity by gain. Just as if the oracles of the Holy Spirit had been recorded with no other design than to serve the purposes of their covetousness, they traffic in it as merchandise exposed to sale.

Withdraw thyself from such. Paul forbids the servants of Christ to have any intercourse with such persons. He not only warns Timothy not to resemble them, but exhorts him to avoid them as dangerous plagues; for, although they do not openly resist the gospel, but, on the contrary, make a false profession of adhering to it, yet their society is infectious. Besides, if the multitude see that we are on familiar terms with those men, the danger is, lest they insinuate themselves under the guise of our friendship. (117) We should therefore, labor to the utmost, that all may know, that so far are we from being agreed with them, that they have no communication with us. (118)