Of the Senses, and Their Pleasures in the Brutes and in Man; And of Pleasures of the Eyes, and Spectacles
If, then, it is in no way permitted to commit homicide, it is not allowed us to be present at all, lest any bloodshed should overspread the conscience, since that blood is offered for the gratification of the people. And I am inclined to think that the corrupting influence of the stage is still more contaminating. For the subject of comedies are the dishonouring of virgins, or the loves of harlots; and the more eloquent they are who have composed the accounts of these disgraceful actions, the more do they persuade by the elegance of their sentiments; and harmonious and polished verses more readily remain fixed in the memory of the hearers. In like manner, the stories of the tragedians place before the eyes the parricides and incests of wicked kings, and represent tragic crimes. And what other effect do the immodest gestures of the players produce, but both teach and excite lusts? Whose enervated bodies, rendered effeminate after the gait and dress of women, imitate unchaste women by their disgraceful gestures. Why should I speak of the actors of mimes, who hold forth instruction in corrupting influences, who teach adulteries while they feign them, and by pretended actions train to those which are true? What can young men or virgins do, when they see that these things are practised without shame, and willingly beheld by all? They are plainly admonished of what they can do, and are inflamed with lust, which is especially excited by seeing; and every one according to his sex forms himself in these representations. And they approve of these things, while they laugh at them, and with vices clinging to them, they return more corrupted to their apartments; and not boys only, who ought not to be inured to vices prematurely, but also old men, whom it does not become at their age to sin.
What else does the practice of the Circensian games contain but levity, vanity, and madness? For their souls are hurried away to mad excitement with as great impetuosity as that with which the chariot races are there carried on; so that they who come for the sake of beholding the spectacle now themselves exhibit more of a spectacle, when they begin to utter exclamations, to be thrown into transports, and to leap from their seats. Therefore all spectacles ought to be avoided, not only that no vice may settle in our breasts, which ought to be tranquil and peaceful; but that the habitual indulgence of any pleasure may not soothe and captivate us, and turn us aside from God and from good works. For the celebrations of the games are festivals in honour of the gods, inasmuch as they were instituted on account of their birthdays, or the dedication of new temples. And at first the huntings, which are called shows, were in honour of Saturnus, and the scenic games in honour of Liber, but the Circensian in honour of Neptune. By degrees, however, the same honour began to be paid also to the other gods, and separate games were dedicated to their names, as Sisinnius Capito teaches in his book on the games. Therefore, if any one is present at the spectacles to which men assemble for the sake of religion, he has departed from the worship of God, and has betaken himself to those deities whose birthdays and festivals he has celebrated.
Source: The Divine Institutes (New Advent)