Orationes contra Arianos
Athanasius's polemical orations defending the full divinity of the Son against Arianism.
Chapter I (The Six Days of Creation)
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Verse 3: And God said: Let there be light
— Cited (Sermon 3) on God's willing being His doing
"For God's willing is His doing, says St. Athanasius, Sermon 3 Against the Arians."