Laudator Temporis Acti

Hesiod, Works and Days 293-297 (tr. Glenn W. Most):

The man who thinks of everything by himself, considering what will be better, later and in the end—this man is the best of all. That man is fine too, the one who is persuaded by someone who speaks well. But whoever neither thinks by himself nor pays heed to what someone else says and lays it to his heart—that man is good for nothing.

οὗτος μὲν πανάριστος, ὃς αὐτὸς πάντα νοήσει
φρασσάμενος τά κ' ἔπειτα καὶ ἐς τέλος ᾖσιν ἀμείνω·
ἐσθλὸς δ' αὖ καὶ κεῖνος, ὃς εὖ εἰπόντι πίθηται·        295
ὃς δέ κε μήτ' αὐτὸς νοέῃ μήτ' ἄλλου ἀκούων
ἐν θυμῷ βάλληται, ὃ δ' αὖτ' ἀχρήιος ἀνήρ.

Livy 22.29.8 (Minucius speaking; tr. J.C. Yardley):

'I have often been told that the best man is he who gives helpful advice, that the man who accepts good advice stands next to him; and that the most inadequate man is he who cannot give advice, but cannot accept it from another, either.'

"saepe ego" inquit, "audivi, milites, eum primum esse virum qui ipse consulat quid in rem sit, secundum eum qui bene monenti oboediat; qui nec ipse consulere nec alteri parere sciat, eum extremi ingenii esse."