14th Century
St. Catherine of Siena
Scholastic & Reform
St. Catherine of Siena (1347 – 1380), Mystic and Doctor of the Church. Wikipedia
"The eye and the hand perceive the white substance of the bread… but the soul sees in that whiteness whole God and whole Man… the Body, the Soul, and the Blood of Christ. "
Dialog of Catherine of Siena
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Why this quote matters
Catherine's Eucharistic mysticism: faith perceives what senses cannot.
Source citation: Letters (various eds.).