Baptism
The prefiguration of baptism in the Spirit hovering over the waters. Allegorically, the Holy Spirit is signified as brooding over the waters of baptism, bringing us to birth and regenerating us (Jerome). Nazianzen called the first light "spiritual" because it was quality without a subject -- proof against heretics who deny accidents without a subject in the Eucharist.
Chapter I (The Six Days of Creation)
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Verse 2: And the earth was without form and void
— The Holy Spirit brooding over the waters of baptism, bringing us to birth and regenerating us.
"Allegorically, the Holy Spirit is here signified as brooding, as it were, over the waters of baptism, and by them bringing us to birth and regenerating us, says St. Jerome, Epistle 83 to Oceanus."
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Verse 3: And God said: Let there be light
— Nazianzen called the first light "spiritual" because it was quality without a subject — proof against heretics who deny accidents without a subject in the Eucharist.
"St. Basil, Theodoret, and Nazianzen think that only the quality of light was here created without a subject -- for which reason Nazianzen calls this light "spiritual." Note this against heretics who deny that accidents can exist without a subject in the Eucharist."