What is a monument built to remember?

Now here I come bouncing in. I will give a test to those who know my works, as a juggler knows the balls. I wrote a line on the grass, and it is my greatest. Can the wiseacres tell me the rest? One suggested the line—A leaf of grass is the journey-work of heaven—the handkerchief of the Lord. No. No. No. But tell me the line I would build a monument to. It is—Grass is the uncut hair of graves.

—Walter (Walt) Whitman

The Twentieth Plane—A Psychic Revelation