'Notions' in the Bible

“Behold, all of you have seen it;Why then do you act vainly and foolishly [cherishing worthless concepts]?

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.

Let no one defraud you of your prize [your freedom in Christ and your salvation] by insisting on mock humility and the worship of angels, going into detail about visions [he claims] he has seen [to justify his authority], puffed up [in conceit] by his unspiritual mind,

If you have died with Christ to the elementary principles of the world, why, as if you were still living in the world, do you submit to rules and regulations, such as,