Dune: Why Was Jessica Told To Bear Only Daughters To The Atreides?

Dune introduces Jessica as a sister of the highly trained, and incredibly powerful, secretive all-female order of spies, scientists, nuns, and theologians known as the Bene Gesserit, also known as the Sisterhood. She is the official concubine of Duke Leto Atreides I and the mother of the ducal heir, Paul Atreides. Jessica has trained her son in the Bene Gesserit Way, which is described in Frank Herbert’s Dune as Paul being trained in “the minutiae of observation.” This explains how Paul studies the smallest clues and tiniest details in people and the surroundings that others might miss.