Remain in the Word

I normally abhor the NAB translation, but today's reading was noteworthy:

Many deceivers have gone out into the world,
those who do not acknowledge Jesus Christ as coming in the flesh;
such as 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.

Update: another way of looking at the term 'progressive' 
https://www.thecatholicthing.org/2024/10/22/the-decomposition-of-synodality/