The Institutes, Book 5
Abbot Theodore’s Answer Through Prayer
We also knew Abbot Theodore, a man gifted with the greatest holiness and with perfect knowledge, not only in the practical life but also in understanding the Scriptures. He had gained it not so much by study and reading, or by worldly education, as by purity of heart alone, since he could barely understand or speak a very few words of the Greek language. When this man was seeking the explanation of a most difficult question, he went on in prayer without ceasing for seven days and nights, until he discovered the answer to the question that had been raised, by a revelation from the Lord.