Ambrose of Milan — as excerpted in the Catena Aurea on Luke 1:1-4

“When he says, It seemed good to me, he does not deny that it seemed good to God: for it is God who predisposes the wills of men. Now no one has doubted that this book of the Gospel is more full of details than the others; by these words then he claims to himself, not any thing that is false, but the truth; and therefore he says, “It seemed good to me, having investigated every thing, to write.” Not to write every thing, but from a review of every thing; “for if all the things which Jesus did were written, I do not think the world itself could contain them.” (John 21:25.) But purposely has Luke passed by things that were written by others, in order that each book of the Gospel might be distinguished by certain mysteries and miracles peculiar to itself.”