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Ambrose of Milan
Catena Aurea · Matthäusevangelium 1
Mt 1, 18English original
Now the birth of Jesus Christ was on this wise: When as His mother Mary was espoused to Joseph, before they came together, she was found with child of the Holy Ghost.
(De Spir. Sanct. ii. 5.) That which is of any thing is either of the substance or the power of that thing; of the substance, as the Son who is of the Father; of the power, as all things are of God, even as Mary was with child of the Holy Spirit.