By other critics a more practical function was given to poetry. Giraldi Cintio asserts that it is the poet's aim to condemn vice and to praise virtue, and Maggi says that poets aim almost exclusively at benefiting the mind. Poets who, on the contrary, treat of obscene matters for the corruption of youth, may be compared with infamous physicians who give their patients deadly poison in the guise of wholesome medicine. Horace and Aristotle, according to Maggi, are at one on this point, for in the definition of tragedy Aristotle ascribes to it a distinctly useful purpose, and whatever delight is obtainable is to be regarded as a result of this moral function; for Maggi and the Renaissance critics in general would follow the Elizabethan poet who speaks of "delight, the fruit of virtue dearly loved." Muzio, in his versified _Arte Poetica_ (1555), regards the end of poetry as pleasure and profit, and the pleasurable aim of poetry as attained by variety, for the greatest poems contain every phase of life and art. It has been seen that Varchi classed poetry with rational philosophy. The end of all arts and sciences is to make human life perfect and happy; but they differ in their modes of producing this result. Philosophy attains its end by teaching; rhetoric, by persuasion; history, by narration; poetry, by imitation or representation. The aim of the poet, therefore, is to make the human soul perfect and happy, and it is his office to imitate, that is, to invent and represent, things which render men virtuous, and consequently happy. Poetry attains this end more perfectly than any of the other arts or sciences, because it does so, not by means of precept, but by means of example. There are various ways of making men virtuous,--by teaching them what vice is and what virtue is, which is the province of ethics; by actually chastising vices and rewarding virtues, which is the province of law; or by example, that is, by the representation of virtuous men receiving suitable rewards for their virtue, and of vicious men receiving suitable punishments, which is the province of poetry. This last method is the most efficacious, because it is accompanied by delight. For men either can not or will not take the trouble to study sciences and virtues--nay, do not even like to be told what they should or should not do; but in hearing or reading poetic examples, not only is there no trouble, but there is the greatest delight, and no one can help being moved by the representation of characters who are rewarded or punished according to an ideal justice.