And till Moses had finished speaking with them, he put a veil on his face.
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Cyril of Alexandria
The shadows bring forth the truth, even if they are not at all the truth themselves. Because of this, the divinely inspired Moses placed a veil upon his face and spoke thus to the children of Israel, all but shouting by this act that a person might behold the beauty of the utterances made through him, not in outwardly appearing figures but in meditations hidden within us.
And having At first, he spoke uncovered. (Menochius)
The Protestants insert the word till in Italics, to insinuate that Moses spoke with a veil on, as St. Paul mentions; (Haydock) and Calmet would translate, "for Moses had ceased to address the people, and had put a veil upon his face "as soon as he perceived that they could not bear the blaze of his countenance. This he did out of modesty, that they might not be afraid of coming to speak freely to him, (Jansenius) though it was also mysterious, as St. Paul remarks. For even until this day, when Moses is read, the veil is upon their heart, (2 Corinthians iii. 15,) as it is upon that of heretics, who cannot see the church. (St. Augustine in Psalm xxx.) (Worthington)