From the foreword: "We are fully assured that there is very much in the four Gospels which manifest the Divine perfections and distinctive beauties of each one, which has not yet been brought forth by those who have sought to explore their inexhaustible depths; that there is here a wide field for diligent research, and that those who will pursue this study, prayerfully, for themselves, will be richly rewarded for their pains."
“In a word, the four Gospels set Christ before us as filling four distinct offices.” (source)
“So it is in the four Gospels: each of the Evangelists was guided by the Spirit to record only that which served to set forth Christ in the particular character in which He was there to be viewed, and that which was not in keeping with that particular character was left out.” (source)
“It is at this point Matthew’s Gospel is to present Christ as the Fulfiller of the promises made to Israel and the prophecies which related to their Messiah. This is why the word ‘fulfilled’ occurs in Matthew fifteen times, and why there are more quotations from the Old Testament in this first Gospel than in the remaining three put together.” (source)
“Why four Gospels? Because one or two was not sufficient to give a perfect presentation of the varied glories of our blessed Lord.” (source)
“He was not himself one of the apostles, but was rather a servant of an apostle.” (source)