“For when for the time ye aught to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat. For every one that useth milk is unskilful in the word of righteousness: for he is a babe. But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.”
What this passage is saying is that those that are new to truth need to be taught the “first principles” or, the basic essentials of the theology as they can not comprehend the deeper and more advanced teachings. Those who are advanced not only in age, but in spiritual knowledge can comprehend the “meat” of the teachings.
It is the meat that is secretly guarded from the profane of the world.