'Rudimentary' in the Bible

So we also, when spiritually we were children, were subject to the world's rudimentary notions, and were enslaved.

Now, however, having come to know God--or rather to be known by Him--how is it you are again turning back to weak and worthless rudimentary notions to which you are once more willing to be enslaved?

See to it that no one takes you captive through philosophy and empty deception [pseudo-intellectual babble], according to the tradition [and musings] of mere men, following the elementary principles of this world, rather than following [the truth—the teachings of] Christ.

If you have died with Christ and have escaped from the world's rudimentary notions, why, as though your life still belonged to the world, do you submit to such precepts as