Lutgardis was born at Tongeren in 1182. She was admitted into the Benedictine monastery of St. Catherine near Sint-Truiden at the age of twelve, not because of a vocation but because her dowry had been lost in a failed business venture. She was attractive, fond of nice clothes and liked to enjoy herself. For Lutgarde, as for so many other women of her time, the cloister represented a socially acceptable alternative to the disgrace of unmarried life in the world. She lived in the convent for several years without having much interest in religious life. She could come and go as she pleased, and received visitors of both sexes.
According to her Vita, it was in the parlour, a welcome break in the monotony of monastic observance, that she was visited with a vision of Jesus showing her his wounds, and at age twenty she made her solemn profession as a Benedictine nun. Some of the sisters predicted that her change in behavior would not last. Instead, she became even more devout. Over the next dozen years, she had many visions of Jesus, Mary and St. John the Evangelist. Robert Bellarmine relates a story that Pope Innocent III, when recently deceased, appeared to Lutgardis in her monastery to thank her for the prayers and sacrifices she had offered for him during his reign as Roman Pontiff.
Accounts of her life state that she experienced ecstasies, levitated, and dripped blood from her forehead and hair when entranced. She refused the honor of serving as abbess. However, in 1205, she was chosen to be prioress of her community.
In 1208, at Aywières (Awirs), near Liège, she joined the Cistercians, a stricter order, on the advice of her friend Christina the Astonishing. The nuns of Aywières spoke French, not Lutgarde’s native Flemish. Despite her efforts, she found the French tongue impossible to master. Living, working, and praying in the midst of her sisters she experienced a loneliness and solitude that she had never known before. Nonetheless, she contributed powerful images to the developing Christocentric mysticism.
The prolific multiplication of Cistercian monasteries of women in the Low Countries obliged the White Nuns to turn to the newly founded friars, disciples of Francis and Dominic, rather than to their brother monks, for spiritual and sacramental assistance. Lutgarde was a friend and mother to the early Dominicans and Franciscans, supporting their preaching by her prayer and fasting, offering them hospitality, ever eager for news of their missions and spiritual conquests. Her first biographer relates that the friars named her mater praedicatorum, the mother of preachers.
Lutgardis was one of the great precursors of the devotion to the Sacred Heart of Jesus. The first recorded mystic revelation of Christ's heart is that of St Lutgardis. According to Thomas Merton, Lutgardis "...entered upon the mystical life with a vision of the pierced Heart of the Saviour, and had concluded her mystical espousals with the Incarnate Word by an exchange of hearts with Him." When, in a visitation, Christ came to Lutgarde, offering her whatever gift of grace she should desire, she asked for a better grasp of Latin, that she might better understand the Word of God and lift her voice in choral praise. Christ granted her request and, after a few days, Lutgarde’s mind was flooded with the riches of psalms, antiphons, readings and responsories. However,a painful emptiness persisted. With disarming candour she returned to Christ, asking to return His gift, and wondering if she might, just possibly, exchange it for another. “And for what would you exchange it?” Christ asked. “Lord, said Lutgarde, I would exchange it for your Heart.” Christ then reached into Lutgarde and, removing her heart, replaced it with His own, at the same time hiding her heart within His breast.
During this time she is known to have shown gifts of healing and prophecy, and was an adept at teaching the Gospels. She was blind for the last eleven years of her life, and died of natural causes at Aywières. According to tradition, she experienced a vision in which Christ informed her of her death. She died on June 16, 1246, the day after the Feast of the Holy Trinity, at the age of 64.