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To be wholly devoted to some intellectual exercise is to have succeeded in life.

Robert Louis Stevenson (2015). “The Complete Novels of Robert Louis Stevenson (Illustrated Edition): Treasure Island, The Strange Case of Dr. Jekyll and Mr. Hyde, Kidnapped, Catriona, The Black Arrow: A Tale of the Two Roses, The Master of Ballantrae, St Ives: Adventures of a French Prisoner in England…”, p.1569, e-artnow
To be wholly devoted to some intellectual exercise is to have succeeded in life.