There are different sorts of truth in life, from simple scientifically verifiable fact to a sort of truth so strong it serves as one of the underlying pillars to hold up reality.
“fact”
Simple, verifiable facts are the staple of life. We live based on knowing that gravity pulls us down and caffeine keeps us awake. The law of non-contradiction, that two contradictory things cannot be true at the same time, is this kind of fact. Experience teaches us these facts as we age, and they shape how we live.
Doubt them at your peril. The results of denying them are usually swift and often painful.
“truth”
The deeper truths of life, like “hurt people hurt people,” are concepts that sum up our experience and teach us important lessons. Wisdom is often characterized as an understanding of these truths.
Truth of this sort may have a valid point to make, as “hurt people hurt people” does, but they’re not usually true clear through. (For example, I’ve found that hurt people who learn to deal with their hurt are the best suited to teach the rest of us how not to hurt others in the first place. Hurt people do not always hurt other people.)
This sort of truth is often the deepest sort people encounter in life. Half-valid characterizations of reality that, while they may provide something of a roadmap for life, don’t really approach the meaning of life or the purpose behind everything.
“Truth”
The highest kind of truth that I’ve encountered, other than the person of Christ Himself, is the kind that can’t be reduced to pithy sayings or quotable quotes, but which is so critical and central to human experience that people spend their entire lives striving to communicate just one such truth to those around them.
The best example is the structure of a house. Though it is covered by walls, it may still be felt in places, where the walls are more solid, and less easily bowed or shifted. In places, it is left bare, like the rafters and columns in a cathedral, cut and polished to perfection. So it is with this world–there is an underlying framework to reality that supports its structure and defines its shape.
Great works of literature and poetry have been written about this sort of truth and may or may not manage to communicate it. Christ taught some of it in parables, knowing that the only way to really illuminate this sort of truth is by the Spirit. Even if it could be broken down into a few words and spoken plainly, the meaning and reality behind it would be entirely closed to someone whose eyes were not opened to it by God Himself.
This is the sort of truth around which reality orients itself. Like the structure inside the walls of a house, it undergirds reality itself and holds it up. This sort of truth never contradicts itself or fails to bear out.
When I see it, I am reminded of Hebrews 1:3, which says, “The Son is the radiance of God’s glory and the exact representation of his being, sustaining all things by his powerful word…”
Looked at from the proper vantage, all of reality is a spectrum of truth that coalesces into the person of Christ, who is also the definition of reality and of being.