Where do we get the Belief that only Authorized Personel can Perform Baptisms??

Two levels of Priesthood.

"11If therefore perfection were by the Levitical priesthood, (for under it the people received the law,) what further need was there that another priest should rise after the order of Melchisedec, and not be called after the order of Aaron?
12For the priesthood being changed, there is made of necessity a change also of the law.
13For he of whom these things are spoken pertaineth to another tribe, of which no man gave attendance at the altar.
14For it is evident that our Lord sprang out of Juda; of which tribe Moses spake nothing concerning priesthood.
15And it is yet far more evident: for that after the similitude of Melchisedec there ariseth another priest,
...
21(For those priests were made without an oath; but this with an oath by him that said unto him, The Lord sware and will not repent, Thou art a priest for ever after the order of Melchisedec:)"
-- Hebrews 7:11-15,21

There are two Priesthoods, the Aaronic and the Melchizedek. The Law of Moses was under the Aaronic or 'lesser' Priesthood, while the New or Higher Law the Christ taught in the Sermon on the Mount is under the Melchizedek or 'Higher' Priesthood. See also Hebrews 5:4.

"1And it came to pass, that, while Apollos was at Corinth, Paul having passed through the upper coasts came to Ephesus: and finding certain disciples,
2He said unto them, Have ye received the Holy Ghost since ye believed? And they said unto him, We have not so much as heard whether there be any Holy Ghost.
3And he said unto them, Unto what then were ye baptized? And they said, Unto John’s baptism.
4Then said Paul, John verily baptized with the baptism of repentance, saying unto the people, that they should believe on him which should come after him, that is, on Christ Jesus.
5When they heard this, they were baptized in the name of the Lord Jesus.
6And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied."
-- Acts 19:1-6

Here Apollos had been baptizing without having the authority, and without giving the Gift of the Holy Ghost. When they learned that there was more to it, they were each Baptized again by the Proper Authority. This was done by Paul, who had that Priesthood Authority.

If Sacred ordinances are not performed by those to whom God has given the Priesthood, then those ordinances are not recognized by God.

Much like having a Drivers License, you might know how to drive, but without that License that gives you authority to drive you will get a ticket for 'driving without a License'. God works the same way.

Military = The Gospel

All branches of the military have some differences in rank but the purpose is still the same. The General gives his commands and it goes through the ranks ensuring the message is sent. The organization still needs to be there to ensure that every soldier can return home safe and to have accomplished their objective. When at war, the soldiers need to work together as a unit to accomplish the goal. The information comes through the chain of command. Without that organization, the army would fail and wouldn't win.

Physical weapons are used to destroy the enemy of the people. 

Spiritual weapons are used to destroy the enemy of our soul.





Air Force Ranks



Everyone has their own rank and their own duties, but without each one of them the army would fall.

The Lord has always called those to stand as officers.(2 Chronicles 23:18)  In the church, there is the Prophet, who acts as the leading General under the direction of Jesus Christ.  The Prophet has two counselors (Exodus 17:12) who would stand as Lieutenant Generals.  The the Quorum of the Twelve Apostles would be Major Generals.  Those who hold the office of Seventy (Luke 10:1) would be Brigadier Generals.  Stake Presidents are like Colonels, with their counselors being Lieutenant Colonels.  Bishops would stand as Majors, with their counselors being Captains.  An Elders Quorum President would be a 1st Lieutenant, and his counselors standing as 2nd Lieutenants. (Matthew 21:23) This is the design that has been established by God to govern the affairs of His church, and just as in a worldly army it all starts at the top and then filters down.



U.S. Military Seals

Each branch of the military specializes in its own field of combat.  You don't usually see an Air Force pilot as a crewman on a Submarine.

Christ has set up His church the same way, there are several organizations designed to best help the people in that area.  They include the Elders Quorum for men over 18, Relief Society for women over 18, Young Mens and Young Womens for ages 12 to 18, Primary for the kids 2 to 12, and a Nursery.

"The Lord's house, is a house of order."

(John 2:13-16 and Doctrine and Covenants 109:8)

The Book of Mormon and the Bible each teach and testify of Christ.  It is by reading these books of scripture which were written by Prophets, or Spiritual Generals, that we learn the battle plans and how to follow our Savior.