William of St. Thierry

William of St. Thierry was a 12th-century Benedictine monk and a leading figure in the Cistercian reform movement, which sought to return to a stricter, more devout monastic life. He emphasized spiritual purity, humility, and inner prayer, encouraging monks to focus on their personal relationship with God rather than external activities. William also wrote influential works on the contemplative life, promoting the idea that true fulfillment comes from deep inner prayer and sacrifices. His teachings helped shape monastic practices and inspired many followers across Europe during the medieval period.