Speak With the Tongue of Angels

This phrase has me fascinated.  I keep trying to imagine what it means and how to be blessed with it.

Nephi gives us some clues.  In 2 Nephi 31:13, he gives us a formula.
I want to try going backwards from the result.

Goal: Speak with the tongue of angels.
→  To receive it you must:  Experience a baptism of fire
→  To receive it you must:  RECEIVE the Holy Ghost.  (open your arms to the Gift.  Accept it with your whole heart.)
→  To receive it you must:  Follow our Savior into the water by being baptized.
→  To receive it you must:  Witness to the Father that you are willing to take upon you the name of Christ.
→  To receive it you must:  Repent of your sins.
→  To receive it you must:  Follow the Son with real intent (no hypocrisy or deception), with full purpose of heart.

Of course, the list is in backwards order.  If you reverse this list, you see that these are the first principles and ordinances of the Gospel.

When we have done all these things, and we receive the ability to speak with the tongue of angels, what do we do with it?  What does it look like?  Nephi has more to say about that later, but here in verse 13 he tells us one thing that we can do with this new gift:  We can shout praises unto the Holy One of Israel.  Does that mean that when we sing praises to the Lord with full purpose of heart we are speaking with the tongues of angels?  The Spirit is testifying to me that that is true.

Elder Boyd K. Packer said: 

Nephi explained that angels speak by the power of the Holy Ghost, and you can speak with the tongue of angels, which simply means that you can speak with the power of the Holy Ghost. It will be quiet. It will be invisible. There will not be a dove. There will not be cloven tongues of fire. But the power will be there.