The same distinction marks off Tragedy from Comedy; for Comedy aims at representing men as worse, Tragedy as better than in actual life.

[ἐν αὐτῇ δὲ τῇ διαφορᾷ καὶ ἡ τραγῳδία πρὸς τὴν κωμῳδίαν διέστηκεν: ἡ μὲν γὰρ χείρους ἡ δὲ βελτίους μιμεῖσθαι βούλεται τῶν νῦν.]

Aristotle (384-322 BC) Greek philosopher

Poetics [Περὶ ποιητικῆς, De Poetica], ch. 2, sec. 4 / 1448a (c. 335 BC) [tr. Butcher (1895)]
    (Source)

Original Greek. Alternate translations:

This difference it is that distinguishes Tragedy and Comedy also; the one would make its personages worse, and the other better, than the men of the present day.
[tr. Bywater (1909)]

Tragedy and Comedy are at the Poles: for the former means to portray a superior, the latter an inferior being to modern man.
[tr. Margoliouth (1911)]

It is just in this respect that tragedy differs from comedy. The latter sets out to represent people as worse than they are to-day, the former as better.
[tr. Fyfe (1932)]

Tragedy too is distinguished from comedy by precisely this difference; comedy prefers to represent people who are worse than those who exist, tragedy people who are better.
[tr. Janko (1987), 1.3]

And tragedy stands in the same relation of difference to comedy; for the one tends to take as subjects men worse than the general run, and the other takes men better than we are.
[tr. Whalley (1997)]

And by this very difference tragedy stands apart in relation to comedy, for the latter intends to imitate those who are worse, and the former better, than people are now.
[tr. Sachs (2006)]

The very same difference makes the distinction between tragedy and comedy: the latter aims to represent people as worse, and the former as better, than people nowadays are.
[tr. Kenny (2013)]