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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.

Frank Herbert (2003). “Dune”, p.253, Penguin
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.