Treasury of Scriptural Knowledge, by R.A. Torrey, [ca. 1880], at sacred-texts.com
The Acts of the Apostles is a most valuable portion of Divine revelation; and, independently of its universal reception in the Christian church, as an authentic and inspired production, it bears the most satisfactory internal evidence of its authenticity and truth. St. Luke's long attendance upon St. Paul, and his having been an eyewitness of many of the facts which he has recorded, independently of his Divine inspiration, render him a most suitable and credible historian; and his medical knowledge, for he is allowed to have been a physician, enabled him both to form a proper judgment of the miraculous cures which were performed by St. Paul, and to give an authentic and circumstantial detail of them. The plainness and simplicity of the narrative are also strong circumstances in its favour. The history of the Acts is one of the most important parts of the Sacred History, for without it neither the Gospels nor Epistles could have been so clearly understood; but by the aid of it the whole scheme of the Christian revelation is set before us in a clear and easy view.