We are all familiar with the classic use by the society of Proverbs 4:18 about "light getting brighter"
They say it applies to revealed truth, and doctrinal changes etc.
Have you ever just read that chapter (and even the surrounding chapters) in full??
It has NOTHING to do with doctrinal changes or teachings.
It has to do with acquiring wisdom and life skills in order to live a successful life. It compares and contrasts a wicked person vs a good person.
In fact vs 24-27 go directly against the way the society! It speaks of not being devious, or straying from the set path. It speaks of NOT inclining to the left or right! That direction to remain set in a straight path flys in the face of the continual "tacking" the society uses with regard to their doctrinal changes.