In what way ideas are to be made agreeable to men's character. On avoiding offense; and, first, on obscenity.
The harmony of idea and subject is a matter fairly easy to understand, but the attuning of idea and men's character is more difficult to grasp and requires more painstaking treatment. For in this inquiry the whole scope of human nature must be thoroughly examined, and our silent inclinations and aversions must be laid open so that we will know how to avoid the one and comply with the other. For it cannot be that anything should please that offends nature, or anything displease that complies with natural inclinations. We will touch briefly on some of these points, but only on those that suffice to our purposes.
In the first place, there is in the nature of man an aversion to the shameful and the obscene, and this the more powerful in the best and well-educated natures. All obscene ideas offend this sense of shame to such an extent that they are regarded as alien to nature, ugly, and uncivilised. Nor does it matter that some corrupt souls laugh at them. For civilization, as we have said, does not consist in agreement with a corrupt, but with a virtuous and moral, nature. Consequently, absolutely nothing of this kind is to be found in the conversation of respectable men, and is only resorted to by those who lack any feeling for Christianity as well as for genuine society and civilization.
Therefore we have excluded all shameful and licentious epigrams not only in deference to morals and religion but also to good taste and civilization. Of this Catullus and Martial in Antiquity witness that they had no perception at all, for they filled up their works with a good deal of ill-bred filth, and on that account must be regarded not only as dissolute but also as vulgar, uncultivated, and, to use Catullus' own phrase, "goat-milkers and ditch-diggers."[18]