Which some professing - Evidently some who professed to be true Christians. They were attracted by false philosophy, and soon, as a consequence, were led to deny the doctrines of Christianity. This result has not been uncommon in the world.
Have erred concerning the faith - see notes on 1 Timothy 1:6-7; 1 Timothy 6:10.
Grace be with thee - see the notes, Romans 1:7.
On the subscription at the close of this Epistle, see Intro., Section 2. It is, like the other subscriptions at the close of the epistles, of no authority.