Remigius of Auxerre
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.
Because Joseph was minded, as has been said, to put Mary away privily, which if he had done, there would have been few who would not rather have thought her a harlot than a virgin, therefore this purpose of Joseph was changed by Divine revelation, whence it is said, While he thought on these things.