There are deep things of God, mysteries, hidden things, of which the apostle Paul often speaks.
The eyes of the natural man cannot discern, nor his ear detect, nor his heart conceive them. Deeper than the azure depths above us, or the fathomless lakes beneath, they defy the wise and prudent of this world. But they are revealed to babes--not in the land of light and glory, but here and now, through the grace of the Holy Spirit. "God hath revealed them unto us by the Spirit."
This is what Jesus promised, that when He, the Spirit of Truth, was come, He would lead us into all the truth, and take of the things of Christ and reveal them unto us. Let us be apt pupils of so transcendent a Teacher. Be willing to do, and you shall know.