Margaret entered the Order of the Visitation. There her life became immediately a shining example to others. God endowed her highly with the gift of prayer. He gave her other favours, such as frequent visitations. The most famous of these was that one when Jesus appeared to her as she knelt in prayer before the Blessed Sacrament. Opening his breast he revealed his divine Heart glowing with flames and encircled with a crown of thorns. He bade her in return for his excessive love and in atonement for the insults of ungrateful men, to seek to have established public adoration of his Heart. This devotion he promised to enrich with treasures of heavenly grace. When, out of humility, she hestitated to undertake so great a task, the loving Saviour encouraged her. At the same time he pointed out Claude de la Colombière, a man of great holiness, as one who could guide and help her. Our Lord also comforted her with the assurance that very great blessings would accrue afterwards to the Church from the worship of his divine Heart.
Margaret strove ardently to fulfil the Redeemer's command. Vexations, even bitter insults were her portion from some who maintained that she was subject to mental aberrations. She not only bore these sufferings patiently, she even profited by them, offering herself in anguish and reproach as a victim acceptable to God, bearing all things as a more sure means of accomplishing her purpose. Renowned for her religious perfection, becoming each day more closely united with her divine spouse by contemplation of celestial things, she took flight to him in the forty-third year of her age, and in the year of restored salvation 1690. She became famous for miracles. Benedict XV added her to the list of the saints; Pius XI extended her office to the universal Church.