Isaac of Stella
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Isaac of Stella (c. 1100, in England – c. 1169, Étoile, Poitiers, Aquitaine, France) was a monk, theologian and philosopher. He joined the Order of Cistercians, during the reforms of Saint Bernard of Clairvaux.
Isaac's works make use of logical argumenation, influenced by Augustine of Hippo's neoplatonism. His main work was Letter to Alcher on the Soul (1162), addressed to Alcher of Clairvaux, which combined Aristotelian and Neoplatonic theories about psychology with Christian mysticism.