Aristophanes, Frogs 1030-6

                                      σκέψαι γὰρ ἀπ’ ἀρχῆς 1030
ὡς ὠφέλιμοι τῶν ποιητῶν οἱ γενναῖοι γεγένηνται.
Ὀρφεὺς μὲν γὰρ τελετάς θ’ ἡμῖν κατέδειξε φόνων τ’ ἀπέχεσθαι,
Μουσαῖος δ’ ἐξακέσεις τε νόσων καὶ χρησμούς, Ἡσίοδος δὲ
γῆς ἐργασίας, καρπῶν ὥρας, ἀρότους· ὁ δὲ θεῖος Ὅμηρος
ἀπὸ τοῦ τιμὴν καὶ κλέος ἔσχεν πλὴν τοῦδ’, ὅτι χρήστ’ ἐδίδαξεν, 1035
τάξεις, ἀρετάς, ὁπλίσεις ἀνδρῶν;

For consider how useful our noble-minded poets have been from the beginning. Orpheus revealed to us the mysteries and abstinence from murder, Musaeus taught us cures from illnesses and oracles, Hesiod working the land, the seasons for fruits, ploughing: but as for godlike Homer, from what did he acquire honour and fame besides this, that he taught useful things: drawing up troops, brave deeds, the arming of men?

Relevant guides	Hesiod