Morning reading at Mass

This struck me, for no particular reason beyond the language, but I thought I’d post:

…Many deceivers have gone out into the world, those who do not acknowledge Jesus Christ as coming in the flesh; such is the deceitful one and the antichrist. Look to yourselves that you do not lose what we worked for but may receive a full recompense. Anyone who is so “progressive” as not to remain in the teaching of the Christ does not have God; whoever remains in the teaching has the Father and the Son.
— Second letter of John