15th Century
Thomas à Kempis
Scholastic & Reform
Thomas à Kempis (c. 1380 – 1471), Canon regular and author of The Imitation of Christ. Wikipedia
"O Lord, I come to You at Your command in simplicity of heart, in good, firm faith, with hope and reverence, and I truly believe that You are present here in this Sacrament, God and man. It is Your will that I receive You and unite myself to You in love. "
Imitation of Christ, Book IV
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Why this quote matters
Devotional classic on simple faith in Real Presence.
Source citation: Imitation of Christ IV.4.