2 Timothy 2:18 Who concerning the truth have erred - Just two persons are mentioned, and to what extent they had erred is unknown. Paul mentions only one point - that pertaining to the resurrection; but says that this was like a gangrene. (Barnes) Wandered .. The resurrection .. their doctrine is identified as gangrene, they had spiritualized the resurrection (like Philo did the O.T.) Augustine supposes, that they taught that there was no resurrection but that which occurs in the soul when it is recovered from the death of sin, and made to live anew. Destroy the faith = their false doctrine was... Overthrow-- trying to subvert "the foundation" on which alone faith can rest secure (2 Timothy 2:19; compare Titus 1:11).