St. Gregory Thaumaturgus
Bishop of Neocaesarea and wonder-worker. At the Virgin's command, received from St. John an explanation of the beginning of his Gospel.
Preface and Praise of Sacred Scripture
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Chapter V: On the Dispositions Required for This Study
— A client of the Blessed Virgin; at her admonition in a dream, received from St. John an explanation of the beginning of his Gospel
"Gregory, surnamed Thaumaturgus, a client of the Blessed Virgin, at her admonition and command in a dream, received from St. John an explanation of the beginning of his Gospel"