12 But our lessons are not such; rather Christ has taught us what is just, and what is seemly, and what is expedient, and all virtue in general, comprising it in few and plain words: at one time saying that, “on two commandments hang the Law and the Prophets;” that is to say, on the love of God and on the love of our neighbor: at another time, “Whatsoever ye would that men should do to you, do ye also to them; for this is the Law and the Prophets.”
And these things even to a laborer, and to a servant, and to a widow woman, and to a very child, and to him that appears to be exceedingly slow of understanding, are all plain to comprehend and easy to learn. For the lessons of the truth are like this; and the actual result bears witness thereto. All at least have learned what things they are to do, and not learned only, but been emulous also of them; and not in the cities alone nor in the midst of the market places, but also in the summits of the mountains.
Yea, for there will you see true wisdom abounding, and choirs of angels shining forth in a human body, and the commonwealth of Heaven manifested here on earth. For a commonwealth did these fishermen too write for us, not with commands that it should be embraced from childhood, like those others, nor making it a law that the virtuous man must be so many years old, but addressing their discourse generally to every age. For those lessons are children's toys, but these are the truth of things.
And as a place for this their commonwealth they have assigned Heaven, and God they have brought in as the framer thereof, and as lawgiver of the statutes there set; as indeed was their duty. And the rewards in their commonwealth are not leaves of bay nor olive, nor an allowance of meat in the public hall, nor statues of brass, these cold and ordinary things, but a life which has no end, and to become children of God, to join the angels' choir, and to stand by the royal throne, and to be always with Christ. And the popular guides of this commonwealth are publicans, and fishermen, and tent-makers, not such as have lived for a short time, but such as are now living for ever. Therefore even after their death they may possibly do the greatest good to the governed.
This republic is at war not with men, but with devils, and those incorporeal powers. Wherefore also their captain is no one of men, nor of angels, but God Himself. And the armor too of these warriors suits the nature of the warfare, for it is not formed of hides and steel, but of truth and of righteousness, and faith, and all true love of wisdom.
Source: Homilies on the Gospel of St. Matthew (New Advent)