Introduction and translation of De Spiritu et Anima, an unpublished booklet attributed to Alcher de Clairvaux

Introduction:

We are faced with an enigmatic text.
Alcher de Clairvaux was a Cistercian monk from the Abbey of Clairvaux who lived during the mandate of Abbot Geoffrey of Auxerre (1162-1165). Isaac de Stella was a Cistercian monk born in England, who was abbot of Stella and who died around 1169.