This discussion of hope reminds me of a passage by Philo of Alexandria in his On Rewards and Punishments (§10 and following), in which he remarks similarly of hope serving as the primary motivator behind all human action. Hope, writes Philo, is “that most vital form of seed which the Creator sowed in the rich soil of the rational soul” and motivates all human action, regardless of one’s intended aim: one hopes for glory achieved in political life; in the hope of successful voyage a skipper sails across the sea; hope of prizes moves the training athlete to endure the contests of the arena. For Philo, this “vital seed” in the human rational soul is best employed in the quest for virtue and wisdom: “the hope of happiness incites also the devotees of virtue to study wisdom, believing that thus they will be able to discern the nature of all that exists and to act in accordance with nature and so bring to their fullness the best types of life, the contemplative and the practical, which necessarily make their possessor a happy man” (p.319 in the Loeb edition).