As Mary pondered all she had learned from reading and from what she had heard and seen, how greatly did she increase in faith, advance in merit, and become enlightened with wisdom! More and more she was consumed with burning love. Drawing life and inspiration from the heavenly mysteries which were being unlocked in her, she was filled with joy; she became alive with the Spirit, she was guided towards God and was kept humble in herself. The effects of divine grace are such indeed that they raise one from the depths to the heights, and transform one in an ever greater degree of glory. Entirely blessed was the mind of the Virgin which, through the direction of the Spirit dwelling in her, ever obeyed the command of the Word of God in all things. She was governed not by her judgments or opinions, but she outwardly performed through her body whatever wisdom had indicated inwardly to her faith. It was surely fitting that divine Wisdom, which had built the house of the Church for its abode, should use the most holy Mary as its instrument, where the observance of the law, purification of the heart, the doctrine of humility and spiritual offering were concerned.
Imitate her, O faithful soul. Enter into the temple of your heart that you may be purified in spirit and cleansed of the pollution of your sins. In everything we do God considers our disposition rather than our actions. And so, whether we retire mentally to God in earnest contemplation and remain at rest or whether we are intent on being of service to those around us with good works and worthy undertakings, let our object be that we are motivated only by love of Christ. So the really acceptable offering of purification of the spirit is that which is rendered not in a man-made temple but in the temple of the heart, where Christ the Lord is pleased to enter.
–from a sermon of St. Laurence Justinian for the Office of Readings; Feast of the Immaculate Heart of Mary