There have been a few experiences that stand out to me when I think of the idea of Truth. One is the familiar feeling it has. It's unmistakable when I'm reading something, or hear something, or ideas come to my mind, the truth sounds familiar. It reminds me of something, some place, or some inner sense that I know, but have forgotten. It may be the exact words I hear or read or it's "between the lines" but it's as though I've literally heard it before. Sometimes I can't tell if I've actually read or heard the same or words or concept recently or just recognizing a truth and it's confirmed by the Holy Ghost. There are times I can't tell the difference.
On the other hand I can contrast that to things that sound familiar just because I've heard them a thousand times. "Don't count your chickens before they ______" We all know how to fill in that phrase because it's familiar to almost everyone. Big difference. One is familiar because of the truth resonating in it, the other just sounds familiar because of repetition. They are very different. Not to be confused with each other.
Familiarity based on repetition doesn't necessarily qualify it as truth. But when you sense something inside you, something just so familiar you know you've heard it before but not sure when or how......that in my view is worth some investigation. I've also learned things that are true that were very new to me, things I had never before considered. Those tend to fill my mind with light, or understanding or refresh my soul with a fresh zeal towards God.
These were just a few thoughts I had today about truth and the variety of ways to recognize it. We're taught the Gospel in it's fullness encompasses all truth. Light and intelligence indeed.