Philotheos (Religious History)
Theodoret's collection of biographies of Syrian ascetics and monks, including St. Marcian's teaching on hearing God through creatures and Scripture.
Preface and Praise of Sacred Scripture
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Chapter I: On the Excellence, Necessity, and Fruit of Sacred Scripture
— St. Marcian quoted (via Theodoret's Philotheos): God speaks daily through creatures and Scripture yet we derive little benefit
"that saying of St. Marcian in Theodoret's Philotheos, who, when asked by the Bishops to speak a word of salvation, said: God speaks to us daily through his creatures and through Sacred Scripture"