“The mystery of Godliness, how great it is” (D&C 19:10). This verse of scripture infers that the rational mind of man cannot find God in the usual ways.
By the power of the rational mind man has conquered the air, sea, and space, but not the mystery of Godliness. This mystery can only be discovered by God revealing Himself—by revelation.
…no man knoweth of his ways save it be revealed unto him; wherefore, brethren, despise not the revelations of God. (Jacob 4:8)
For what man knoweth the things of a man, save the spirit of man which is in him? even so the things of God knoweth no man, but the Spirit of God. (1 Corinthians 2:11)
Revelations come in many ways. On occasion, mortals are dramatically exposed to God’s revelations.