1 At the shows in the circus the spectator must join in the efforts of the athletes. This the laws of the show indicate, for they prescribe that all should have the head uncovered when present at the stadium. The object of this, in my opinion, is that each one there should not only be a spectator of the athletes, but be, in a certain measure, a true athlete himself. Thus, to investigate the great and prodigious show of creation, to understand supreme and ineffable wisdom, you must bring personal light for the contemplation of the wonders which I spread before your eyes, and help me, according to your power, in this struggle, where you are not so much judges as fellow combatants, for fear lest the truth might escape you, and lest my error might turn to your common prejudice. Why these words? It is because we propose to study the world as a whole, and to consider the universe, not by the light of worldly wisdom, but by that with which God wills to enlighten His servant, when He speaks to him in person and without enigmas. It is because it is absolutely necessary that all lovers of great and grand shows should bring a mind well prepared to study them. If sometimes, on a bright night, while gazing with watchful eyes on the inexpressible beauty of the stars, you have thought of the Creator of all things; if you have asked yourself who it is that has dotted heaven with such flowers, and why visible things are even more useful than beautiful; if sometimes, in the day, you have studied the marvels of light, if you have raised yourself by visible things to the invisible Being, then you are a well prepared auditor, and you can take your place in this august and blessed amphitheatre. Come in the same way that any one not knowing a town is taken by the hand and led through it; thus I am going to lead you, like strangers, through the mysterious marvels of this great city of the universe. Our first country was in this great city, whence the murderous dæmon whose enticements seduced man to slavery expelled us. There you will see man's first origin and his immediate seizure by death, brought forth by sin, the first born of the evil spirit. You will know that you are formed of earth, but the work of God's hands; much weaker than the brute, but ordained to command beings without reason and soul; inferior as regards natural advantages, but, thanks to the privilege of reason, capable of raising yourself to heaven. If we are penetrated by these truths, we shall know ourselves, we shall know God, we shall adore our Creator, we shall serve our Master, we shall glorify our Father, we shall love our Sustainer, we shall bless our Benefactor, we shall not cease to honour the Prince of present and future life, Who, by the riches that He showers upon us in this world, makes us believe in His promises and uses present good things to strengthen our expectation of the future. Truly, if such are the good things of time, what will be those of eternity? If such is the beauty of visible things, what shall we think of invisible things? If the grandeur of heaven exceeds the measure of human intelligence, what mind shall be able to trace the nature of the everlasting? If the sun, subject to corruption, is so beautiful, so grand, so rapid in its movement, so invariable in its course; if its grandeur is in such perfect harmony with and due proportion to the universe: if, by the beauty of its nature, it shines like a brilliant eye in the middle of creation; if finally, one cannot tire of contemplating it, what will be the beauty of the Sun of Righteousness? If the blind man suffers from not seeing the material sun, what a deprivation is it for the sinner not to enjoy the true light!
2. “And God said, Let there be lights in the firmament of the heaven to give light upon the earth, and to divide the day from the night.” Heaven and earth were the first; after them was created light; the day had been distinguished from the night, then had appeared the firmament and the dry element. The water had been gathered into the reservoir assigned to it, the earth displayed its productions, it had caused many kinds of herbs to germinate and it was adorned with all kinds of plants. However, the sun and the moon did not yet exist, in order that those who live in ignorance of God may not consider the sun as the origin and the father of light, or as the maker of all that grows out of the earth. That is why there was a fourth day, and then God said: “Let there be lights in the firmament of the heaven.”
When once you have learned Who spoke, think immediately of the hearer. God said, “Let there be lights...and God made two great lights.” Who spoke? And Who made? Do you not see a double person? Everywhere, in mystic language, history is sown with the dogmas of theology.
The motive follows which caused the lights to be created. It was to illuminate the earth. Already light was created; why therefore say that the sun was created to give light? And, first, do not laugh at the strangeness of this expression. We do not follow your nicety about words, and we trouble ourselves but little to give them a harmonious turn. Our writers do not amuse themselves by polishing their periods, and everywhere we prefer clearness of words to sonorous expressions. See then if by this expression “to light up,” the sacred writer sufficiently made his thought understood. He has put “to give light” instead of “illumination.” Now there is nothing here contradictory to what has been said of light. Then the actual nature of light was produced: now the sun's body is constructed to be a vehicle for that original light. A lamp is not fire. Fire has the property of illuminating, and we have invented the lamp to light us in darkness. In the same way, the luminous bodies have been fashioned as a vehicle for that pure, clear, and immaterial light. The Apostle speaks to us of certain lights which shine in the world without being confounded with the true light of the world, the possession of which made the saints luminaries of the souls which they instructed and drew from the darkness of ignorance. This is why the Creator of all things, made the sun in addition to that glorious light, and placed it shining in the heavens.
Source: Nine Homilies of Hexaemeron (New Advent)