And there are many similar sayings that indicate following the esoteric.

The Apostle Paul explicitly stated this meaning in his first epistle to the people of Corinth, in the second chapter thereof, saying:

"Yet we speak wisdom among the perfect, but a wisdom not of this age, nor of the rulers of this age, who are coming to nothing. But we speak the wisdom of God in the secret of the hidden wisdom, which God predestined before the ages for our glory, which none of the rulers of this age knew; for had they known, they would not have crucified the Lord of Glory. But as it is written: 'What eye has not seen, and ear has not heard, and has not entered into the heart of man: what God has prepared for those who love Him.' But God has revealed [it] to us through His Spirit, for the Spirit searches all things, even the depths of God. For who among men knows the things of a man except the spirit of the man which is in him? So also, no one knows the things of God except the Spirit of God. Now we have received not the spirit of the world, but the Spirit who is from God, that we might know the things gifted to us by God, which we also speak, not in words taught by human wisdom but in those taught by the Holy Spirit, comparing spiritual things with spiritual things.

But the natural man does not accept the things of the Spirit of God, for they are foolishness to him; and he cannot understand them, because they are spiritually discerned. But he who is spiritual judges all things,