Books
A thing is not high if one can reach it; it is not great if one can reason about it; it is not deep if one can see its bottom.
— Ayn Rand · The Fountainhead

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A claim about measuring greatness: if you can reach something, it isn't high; if reasoning can grasp it, it isn't great; if you can see the bottom, it isn't deep. Each comparison says true scale should exceed our reach or understanding.
Context reviewed