John Ruskin, Modern Painters 5.11:
Color is, therefore, in brief terms, the type of love. Hence it is especially connected with the blossoming of the earth; and again, with its fruits; also, with the spring and fall of the leaf, and with the morning and evening of the day, in order to show the waiting of love about the birth and death of man.
And now, I think, we may understand, even far away in the Greek mind, the meaning of that contest of Apollo with the Python. It was a far greater contest than that of Hercules with Ladon. Fraud and avarice might be overcome by frankness and force; but this Python was a darker enemy, and could not be subdued but by a greater god. Nor was the conquest slightly esteemed by the victor deity. He took his great name from it thenceforth—his prophetic and sacred name—the Pythian.
It could, therefore, be no merely devouring dragon—no mere wild beast with scales and claws. It must possess some more terrible character to make conquest over it so glorious. Consider the meaning of its name, “THE CORRUPTER.” That Hesperid dragon was a treasure-guardian. This is the treasure-destroyer,—where moth and rust doth corrupt—the worm of eternal decay.
Apollo’s contest with him is the strife of purity with pollution; of life, with forgetfulness; of love, with the grave.
I believe this great battle stood, in the Greek mind, for the type of the struggle of youth and manhood with deadly sin—venomous, infectious, irrecoverable sin. In virtue of his victory over this corruption, Apollo becomes thenceforward the guide; the witness; the purifying and helpful God. The other gods help waywardly, whom they choose. But Apollo helps always: he is by name, not only Pythian, the conqueror of death; but Pæan—the healer of the people.
Well did Turner know the meaning of that battle: he has told its tale with fearful distinctness. The Mammon dragon was armed with adamant; but this dragon of decay is a mere colossal worm: wounded, he bursts asunder in the midst, and melts to pieces, rather than dies, vomiting smoke—a smaller serpent-worm rising out of his blood.