Theophylact of Ohrid
Catena Aurea · Lukasevangelium 1
And fear came on all that dwelt round about them: and all these sayings were noised abroad throughout all the hill country of Judæa. And all they that heard them laid them up in their hearts, saying, What manner of child shall this be! And the hand of the Lord was with him.
As at the silence of Zacharias the people marvelled, so likewise when he spoke. Hence it is said, And fear came upon all; that from these two circumstances all might believe there was something great in the child that was born. But all these things were ordained, to the end that he who was to bear witness of Christ might also be esteemed trustworthy. Hence it follows, And all they that heard them laid them up in their heart, saying, What manner of child, &c.