I urge you, Brothers, to be on your guard against people who, by disregarding the teaching which you received, cause divisions and create difficulties; dissociate yourselves from them.
Not lightly to let your minds become unsettled, nor yet to be disturbed by any revelation, or by any message, or by any letter, purporting to come from us, to the effect that the Day of the Lord is come.
We urge you, Brothers, in the name of the Lord Jesus Christ, to avoid any Brother who is living an ill-ordered life, which is not in agreement with the teaching that you received from us.
who holds doctrine that can be relied on as being in accordance with the accepted Teaching; so that he may be able to encourage others by sound teaching, as well as to refute our opponents.
Dear friends, while I was making every effort to write to you about our common Salvation, I felt that I must write to you at once to urge you to fight in defense of the Faith that has once for all been entrusted to the keeping of Christ's People.