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.
The ancients must have read the Duden (the German dictionary) incorrectly. They must have meant "Selbstkontrolle" or "Selbstbeherrschung" (self-restraint), "Spannungsbogen" doesn´t make sense (which means the build up of tension and suspense towards an climax over the course of a story, whether it being a book or a movie).
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