In the preface to the volume of his commentary on the Gospels, Matthew Henry explains what this part of the New Testament story is all about:
The one half of our undertaking upon the New Testament is now, by the assistance of divine grace, finished, and presented to the reader, who, it is hoped, the Lord working with it, may hereby be somewhat helped in understanding and improving the sacred history of Christ and his apostles, and in making it, as it certainly is, the best exposition of our creed, in which these inspired writers are summed up, as is intimated by that evangelist who calls his gospel a declaration of those things which are most surely believed among us, Lu. 1:1. And, as there is no part of scripture in the belief of which it concerns more to be established, so there is none with which the generality of Christians are more conversant, or which they speak of more frequently.
It is therefore our duty, by constant pains in meditation and prayer, to come to an intimate acquaintance with the true intent and meaning of these narratives, what our concern is in them, and what we are to build upon them and draw from them; that we may not rest in such a knowledge of them as that which we had when in our childhood we were taught to read English out of the translation and Greek out of the originals of these books.