The Gravemind has some amazing quotes. These are a few of my favorites.
"This one is machine and nerve, and has its mind concluded. This one is but flesh and faith, and is the more deluded."
"Now the gate has been unlatched, headstones pushed aside; corpses shift and offer room, a fate you must abide!"
And, of course, Sergeant Johnson!
"When I joined the Corps, we didn't have any fancy-schmanzy tanks. We had sticks! Two sticks, and a rock for the whole platoon—and we had to share the rock! Buck up, boy, you are one very lucky marine!"