A perfect knowledge

When we exercise faith in something and receive that "swelling" in our breasts, as Alma speaks of it, we are receiving a witness or a testimony of that thing. Faith is no longer necessary in this thing; it is now a perfect knowledge made manifest to you by the Holy Ghost. Throughout most of my youth there were many parts of the gospel that I simply had faith that they were true. It was not until I received an actual witness from the Spirit that they were indeed true that I then 'knew' them to be true.