Over the exit of the Arrakeen landing field, crudely carved as though with a
poor instrument, there was an inscription that Muad'Dib was to repeat many
times. He saw it that first night on Arrakis, having been brought to the ducal
command post to participate in his father's first full staff conference. The
words of the inscription were a plea to those leaving Arrakis, but they fell
with dark import on the eyes of a boy who had just escaped a close brush with
death. They said: "O you who know what we suffer here, do not forget us in your
prayers. "

-from "Manual of Muad'Dib" by the Princess Irulan