First of all, tragedy was introduced to remind us that certain events happen, and are fated to happen as they do; and to teach us that what entertains us on the stage should not grieve us on the greater stage of the world. You see that such things must be accomplished; and that even they bore them who cried aloud, O Cithaeron! Our dramatic poets have said some excellent things; especially the following:—
Me and my children, if the Gods neglect,
It is for some good reason—
and again,
Vain is all anger at external things;
and,
To reap our life like ears of ripened corn—
and the like.
And after tragedy came the Old Comedy, using a schoolmaster's freedom of speech, and employing plain language with great profit to inculcate the duty of humility. To this end Diogenes used a method much the same. Next consider the nature of the Middle Comedy; and lastly for what purpose the New was introduced, which gradually degenerated into the mere ingenuity of artificial mimicry. It is well known that some useful things were said by the New Comic Writers; but what useful end had they in view in all their accumulated poetry and playmaking?