The Duchess of Feria, Ana Ponce de Leon, became a Poor Clare after the death of her husband.  Her spiritual director was Saint John of Avila, who preached when she was given the holy habit. She received the surname “spouse of the Most Blessed Sacrament” because of her exceptional devotion to the Eucharist. 
When asked how she could spend so much time in adoration, she replied, “I could remain there for all eternity. And is not there present the very essence of God, who will be the food of the blessed? Good God! Am I asked what I do in his presence? Why am I not rather asked, what is not done there? We love, we ask, we praise, we give thanks.  We ask, what does a poor man do in the presence of one who is rich?  What does a sick man do in the presence of his physician? What does a man do who is parched with thirst in the presence of a fountain? What is the occupation of one who is starving, and is placed before a splendid table?”