Mosiah 12:21 - 12:25
Mosiah 12:21 How beautiful upon the mountains are the feet of him that bringeth good tidings; that publisheth peace; that bringeth good tidings of good; that publisheth salvation; that saith unto Zion, Thy God reigneth;
Isaiah is telling us of the blessed state of all those who through the years have preached or attempted to bring the gospel message to our Heavenly Father's children. This not only refers to prophets of old but the young 18 year old missionaries of this dispensation as well. Because of all the activity over the last 6000 years in trying to bring the gospel to His children, it shows that God is actively engaged in influencing the events of history to accomplish this aim.
Mosiah 12:22 Thy watchmen shall lift up the voice; with the voice together shall they sing; for they shall see eye to eye when the Lord shall bring again Zion;
There will be a unity of purpose and methods when bringing the gospel to the world's inhabitants.
[There will not be all the different demoninations or individual approaches we see in the world to preach the gospel. The gospel is to be preach under the authority of the priesthood and direction of the prophet, not men who decide on their own to do so.]
Mosiah 12:23 Break forth into joy; sing together ye waste places of Jerusalem; for the Lord hath comforted his people, he hath redeemed Jerusalem;
This will cause the world to be ever so thankful to our Heavenly Father for what He has done for us even when we were entirely ignorant of what He was doing. We will see that we have really not been on our own and that God has been in the background influencing history to bring about his purposes.
Mosiah 12:24 The Lord hath made bare his holy arm in the eyes of all the nations, and all the ends of the earth shall see the salvation of our God?
In time all the inhabitants of this world will see this and have to praise God for all His efforts on our behave even thought many of His children didn't live His commandments when they knew better or know of His existence.
Mosiah 12:25 And now Abinadi said unto them: Are you priests, and pretend to teach this people, and to understand the spirit of prophesying, and yet desire to know of me what these things mean?
Abinadi now questions their fitness to be priests. If they do not know the meaning of these verses of scripture from Isaiah , he asks how can they be spiritual advisers to the king or the people.
[We might ask ourselves if we know the meaning of the four verses? What judgments can we pass on ourselves if we don't understand them either? If we don't understand, maybe this is a gauge of our ability to be influenced by the spirit of prophesying which is the key to understand the scriptures.]