World Wide Study Bible
a Bible passage
5. Perverse disputings—useless disputings. The oldest manuscripts read, "lasting contests" [Wiesinger]; "incessant collisions" [Alford]. "Strifes of words" had already been mentioned so that he would not be likely to repeat the same idea (as in the English Version reading) again.
destitute of the truth—(Tit 1:14). They had had the truth, but through want of moral integrity and of love of the truth, they were misled by a pretended deeper gnosis (knowledge) and higher ascetical holiness, of which they made a trade [Wiesinger].
supposing, &c.—The Greek requires, "supposing (regarding the matter in this point of view) that piety (so translated for 'godliness') is a means of gain (that is, a way of advancing one's worldly interests: a different Greek form, poriswa, expresses the thing gained, gain)"; not "that gain is godliness," as English Version.
from such withdraw thyself—omitted in the oldest manuscripts. The connection with 1Ti 6:6 favors the omission of these words, which interrupt the connection.