The scarce water of Dune is an exact analog of oil scarcity. CHOAM is OPEC.
What you cannot control, you must accept.
Most of us choose our companions and surroundings to reflect ourselves.
The best contribution one can make to humanity is to improve oneself.
Time is a measure of space, just as a range-finder is a measure of space, but measuring locks us into the place we measure.
The Fremen were supreme in that quality the ancients called "spannungsbogen" -- which is the self-imposed delay between desire for a thing and the act of reaching out to grasp that thing.