ARTICLE OF FAITH 5 - CALLED OF GOD BY PROPHECY AND BY THOSE IN AUTHORITY

According to the Fifth Article of Faith of the Church of Jesus Christ of Latter Day Saints which has been restored to the earth:

Fifth Article of Faith.

We believe that a man must be called of God, by prophecy, and by the laying on of hands by those who are in authority, to preach the Gospel and administer in the ordinances thereof.

There is not one instance in the scriptures of anyone taking to himself the authority to perform sacred ordinances and then being acknowledged by the Lord after that he was authorized to perform the administration of the ordinances His name. 

The Lord calls His servants through those who have His authority on the earth or He will do it directly Himself, as with the Apostles.

Men are called by prophesy and the Laying on of Hands by those in Authority. 

The Holy Melchizedek Priesthood descended from Adam to Noah under the Hands of the Fathers. 

Adam ordained Enos, Mahalaleel, Jared, Enoch and Methuselah under his hands.  Lamech was ordained under the hands of Seth and Noah was ordained under the hands of Methuselah. 

Even Abraham was ordained a High Priest under the hands of Melchizedek who himself received his own through the direct lineage of his fathers from Noah.

In modern revelation in these Last Days we find out more about the True Priesthood authorized by God.

DOCTRINE and COVENANTS 107: 2-4

2 Why the first is called the Melchizedek Priesthood is because Melchizedek was such a great high priest.

3 Before his day it was called the Holy Priesthood, after the Order of the Son of God.

4 But out of respect or reverence to the name of the Supreme Being, to avoid the too frequent repetition of his name, they, the church, in ancient days, called that priesthood after Melchizedek, or the Melchizedek Priesthood.

Even Evil Spirits Know Who Has Real Authority From God.  

ACTS 19: 11-16

11 And God wrought special miracles by the hands of Paul:

12 So that from his body were brought unto the sick handkerchiefs or aprons, and the diseases departed from them, and the evil spirits went out of them.

13 Then certain of the vagabond Jews, exorcists, took upon them to call over them which had evil spirits the name of the Lord Jesus, saying, We adjure you by Jesus whom Paul preacheth.

14 And there were seven sons of one Sceva, a Jew, and chief of the priests, which did so.

15 And the evil spirit answered and said, Jesus I know, and Paul I know; but who are ye?

16 And the man in whom the evil spirit was leaped on them, and overcame them, and prevailed against them, so that they fled out of that house naked and wounded.

No one can take it upon himself the priesthood without being called by someone in Authority.  Otherwise it becomes priest craft.  You must be called of God through one of His authorized servants who have the Authority of the Melchizedek Priesthood.  You cannot take on that true authority by schooling.

2 NEPHI 26:  29

29 He commandeth that there shall be no priest crafts; for, behold, priest crafts are that men preach and set themselves up for a light unto the world, that they may get gain and praise of the world; but they seek not the welfare of Zion.
Paul said this: 

HEBREWS 5: 4

4 And no man taketh this honour unto himself, but he that is called of God, as was Aaron.

We know Aaron was called through Moses unto whom the Lord revealed his will in the matter. 

This authority to act in the name of the Lord is given to those only who are chosen of God.