Ambrose of Milan
Catena Aurea · Lukasevangelium 1
Forasmuch as many have taken in hand to set forth in order a declaration of those things which are most surely believed among us, Even as they delivered them unto us, which from the beginning were eyewitnesses, and ministers of the word: It seemed good to me also, having had perfect understanding of all things from the very first, to write unto thee in order, most excellent Theophilus, That thou mightest know the certainty of those things, wherein thou hast been instructed.
This expression is used, not that we should suppose the ministry of the word to consist rather in seeing than hearing, but that, because by the word was meant not a word that can be spoken by the mouth, but one of real existence, we may understand that to have been not a common, but a Heavenly Word, to which the Apostles ministered.