
Ambrose of Milan
Catena Aurea · Matthäusevangelium 1
But while he thought on these things, behold, the angel of the Lord appeared unto him in a dream, saying, Joseph, thou son of David, fear not to take unto thee Mary thy wife: for that which is conceived in her is of the Holy Ghost.
In this word appeared is conveyed the power of Him that did appear, allowing Himself to be seen where and how He pleases.