The man who knows what’s right and is tenacious
In the knowledge of what he knows cannot be shaken,
Not by people righteously impassioned In a wrong cause, and not by menancings

Of tyrants frowns, nor by the wind that roils
. . .the sky could fall
In pieces around him, he would not quail.

–Horace, Ode iii.3, “The Constancy of Purpose”

In memoriam, Cpl. Chris Mason, and others who had that constancy.