Saints were sometimes rewarded by God for loving Him so much that they offered the Lord total dominion over their heart.
Many famous saints, including several Doctors of the Church, experienced different forms of the transverberation, which could come in the form of mystical vision, a physical wounding of the heart by a dart or a flame of love.
In one very rare instance, that of St. Veronica Giuliani, the imprint of the cross was actually made upon the heart of a saint, and after her death this heart and the image upon it has been preserved.
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Saint Teresa of Avila[Doctor of the Church]
St. Teresa of Avila