Category: depth...

to be drawn closer and closer to a tiny scene and wonder at its depth and detail
a depth of perception
the depth of absorption of a writer's mind
a classic Cape Cod sky, startling in its clarity and depth
depth psychology, study of the unconscious
depth and structure, even the time of day, defined by minute differentiations in the tint of paint
the ocean's appearing transparent to sunlight near the surface but becoming opaque with depth
determining the depth of water by measuring the time it takes a sound (sonic pulse) to return/echo from the bottom
It's not the length of life, but depth of life. (RW Emerson)
We have deep depth. (Yogi Berra)
How do I love thee? Let me count the ways./ I love thee to the depth and breadth and height / My soul can reach, when feeling out of sight / For the ends of Being and ideal Grace. (Elizabeth Barrett Browning)
In the depth of winter I finally learned that there within one lay an invincible summer. (Albert Camus)
Do not hover always on the surface of things, nor take up suddenly, with mere appearances; but penetrate into the depth of matters, as far as your time and circumstances allow, especially in those things which relate to your profession (Isaac Watts)
What matters is not the idea a man holds, but the depth at which he holds it. (Ezra Pound)