Eusebius of Caesarea
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.
(Eccl. Hist. iii. 4.) St. Luke at the commencement of his Gospel has told us the reason of his writing, which was, that many others had rashly taken upon themselves to give accounts of those things of which he had a more certain knowledge. And this is his meaning when he says, Forasmuch as many have taken in hand to set forth in order a declaration of things.