This was the commendation which Persius gave him; where by vitium he means those little vices which we call follies, the defects of human understanding, or at most the peccadilloes of life, rather than the tragical vices to which men are hurried by their unruly passions and exorbitant desires. But in the word omne, which is universal, he concludes with me that the divine wit of Horace left nothing untouched; that he entered into the inmost recesses of nature; found out the imperfections even of the most wise and grave, as well as of the common people; discovering even in the great Trebatius (to whom he addresses the first satire) his hunting after business and following the court, as well as in the prosecutor Crispinus, his impertinence and importunity. It is true, he exposes Crispinus openly as a common nuisance; but he rallies the other, as a friend, more finely. The exhortations of Persius are confined to noblemen, and the Stoic philosophy is that alone which he recommends to them; Juvenal exhorts to particular virtues, as they are opposed to those vices against which he declaims; but Horace laughs to shame all follies, and insinuates virtue rather by familiar examples than by the severity of precepts.
This last consideration seems to incline the balance on the side of Horace, and to give him the preference to Juvenal, not only in profit, but in pleasure. But, after all, I must confess that the delight which Horace gives me is but languishing (be pleased still to understand that I speak of my own taste only); he may ravish other men, but I am too stupid and insensible to be tickled. Where he barely grins himself, and, as Scaliger says, only shows his white teeth, he cannot provoke me to any laughter. His urbanity--that is, his good manners--are to be commended; but his wit is faint, and his salt (if I may dare to say so) almost insipid. Juvenal is of a more vigorous and masculine wit; he gives me as much pleasure as I can bear; he fully satisfies my expectation; he treats his subject home; his spleen is raised, and he raises mine. I have the pleasure of concernment in all he says; he drives his reader along with him, and when he is at the end of his way, I willingly stop with him. If he went another stage, it would be too far; it would make a journey of a progress, and turn delight into fatigue. When he gives over, it is a sign the subject is exhausted, and the wit of man can carry it no farther. If a fault can be justly found in him, it is that he is sometimes too luxuriant, too redundant; says more than he needs, like my friend "the Plain Dealer," but never more than pleases. Add to this that his thoughts are as just as those of Horace, and much more elevated; his expressions are sonorous and more noble; his verse more numerous; and his words are suitable to his thoughts, sublime and lofty. All these contribute to the pleasure of the reader; and the greater the soul of him who reads, his transports are the greater. Horace is always on the amble, Juvenal on the gallop, but his way is perpetually on carpet-ground. He goes with more impetuosity than Horace, but as securely; and the swiftness adds a more lively agitation to the spirits. The low style of Horace is according to his subject--that is, generally grovelling.
I question not but he could have raised it, for the first epistle of the second book, which he writes to Augustus (a most instructive satire concerning poetry), is of so much dignity in the words, and of so much elegancy in the numbers, that the author plainly shows the sermo pedestris in his other satires was rather his choice than his necessity. He was a rival to Lucilius, his predecessor, and was resolved to surpass him in his own manner. Lucilius, as we see by his remaining fragments, minded neither his style, nor his numbers, nor his purity of words, nor his run of verse. Horace therefore copes with him in that humble way of satire, writes under his own force, and carries a dead weight, that he may match his competitor in the race. This, I imagine, was the chief reason why he minded only the clearness of his satire, and the cleanness of expression, without ascending to those heights to which his own vigour might have carried him. But limiting his desires only to the conquest of Lucilius, he had his ends of his rival, who lived before him, but made way for a new conquest over himself by Juvenal his successor.
He could not give an equal pleasure to his reader, because he used not equal instruments. The fault was in the tools, and not in the workman. But versification and numbers are the greatest pleasures of poetry. Virgil knew it, and practised both so happily that, for aught I know, his greatest excellency is in his diction. In all other parts of poetry he is faultless, but in this he placed his chief perfection. And give me leave, my lord, since I have here an apt occasion, to say that Virgil could have written sharper satires than either Horace or Juvenal if he would have employed his talent that way. I will produce a verse and half of his, in one of his Eclogues, to justify my opinion, and with commas after every word, to show that he has given almost as many lashes as he has written syllables. It is against a bad poet, whose ill verses he describes "Non tu, in triviis indocte, solebas Stridenti, miserum, stipula, disperdere carmen?"