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.

Growth is limited by the necessity which is present in the least amount. And naturally, the least favorable condition controls the growth rate.

There is no escape—we pay for the violence of our ancestors.

The Fremen have a simple, practical religion,” he said.“Nothing about religion is simple.

To be a god can ultimately become boring and degrading. There'd be reason enough for the invention of free will! A god might wish to escape into sleep and be alive only in the unconscious projections of his dream-creatures.