The rest of this post quotes Elder Bruce R. McConkie, General Conference Oct. 1978.

"This gift is the right to the constant companionship of that member of the Godhead, based on faithfulness. This gift is the right to receive revelation from the Holy Spirit. “No man can receive the Holy Ghost without receiving revelations,” the Prophet said, for “the Holy Ghost is a revelator” (Teachings of the Prophet Joseph Smith, comp. Joseph Fielding Smith, Salt Lake City: Deseret Book Company, 1977, p. 328).

...

Truly, the Holy Ghost is a revelator. He speaks and his voice is the voice of the Lord. He is Christ’s minister, his agent, his representative. He says what the Lord Jesus would say if he were personally present.

Speaking “unto all those who” are “ordained unto” his “priesthood,” the Lord says: “And whatsoever they shall speak when moved upon by the Holy Ghost shall be scripture, shall be the will of the Lord, shall be the mind of the Lord, shall be the word of the Lord, shall be the voice of the Lord, and the power of God unto salvation” (D&C 68:2–4).

Truly this is that promised day when “every man might speak in the name of God the Lord, even the Savior of the world” (D&C 1:20).

If all of the Latter-day Saints lived as they should, then Moses’ petition would be granted: “Would God that all the Lord’s people were prophets, and that the Lord would put his spirit upon them!” (Num. 11:29).

This is the promised day when “God shall give unto” us “knowledge by his Holy Spirit,” when, “by the unspeakable gift of the Holy Ghost,” we shall gain knowledge “that has not been revealed since the world was until now” (D&C 121:26).

This is the day of which Joseph Smith said: “God hath not revealed anything to Joseph, but what He will make known unto the Twelve, and even the least Saint may know all things as fast as he is able to bear them” (Teachings, p. 149).

...

By his own mouth he has given us this promise: “It shall come to pass that every soul who forsaketh his sins and cometh unto me, and calleth on my name, and obeyeth my voice, and keepeth my commandments, shall see my face and know that I am” (D&C 93:1).

Such is his promise to us here and now while we yet dwell as mortals in a world of sorrow and sin. It is our privilege even now—the privilege of all who hold the holy priesthood—if we will strip ourselves from jealousies and fears and humble ourselves before him, as he has said, to have the veil rent and see him and know that he is. (See D&C 67:10.)