Isaiah 5

In parable, when Isaiah compares the offspring of Israel to grapes, he states the Lord - 

"...also made a winepress therein..."  (Isaiah 5:2)

Which suggests to me that that there would be tribulation wherein that we may grow and prove ourselves.

Another thought this morning where Isaiah experienced - 

"Then flew one of the seraphims unto me, having a live coal in his hand, which he had taken with the tongs from off the altar:

7 And he laid it upon my mouth, and said, Lo, this hath touched thy lips; and thine iniquity is taken away, and thy sin purged."  (Isaiah 6:6–7)

The scriptures teach that we are purified by fire when we are - 

 

"...wrought upon and cleansed by the power of the Holy Ghost..."  (Moroni 6:4)

That seraphim could have been the Holy Ghose.