This first comforter, or Holy Ghost, has no other effect than pure intelligence. It is …powerful in expanding the mind [and] enlightening the understanding.Joseph Smith
Source: Willard Richards Pocket Companion
The Words of Joseph Smith: Page 4
Why I picked this quote?
I like the description here of the Holy Ghost as “pure intelligence.” I have experienced that expanding of the mind and enlightening of the understanding through the Spirit of God, and pure intelligence flowing to me is a great way to describe it.