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Plato was the Exarch of Ravenna from 645 to 649. He is known primarily for his monothelitism, as well as for his opposition to Pope Theodore I, whom he convinced Patriarch Paul II of Constantinople to break with.
“Wonder is the feeling of a philosopher, and philosophy begins in wonder.”
“No one should be discouraged, Theaetetus, who can make constant progress, even though it be slow.”
“Phaedrus: Socrates, you easily make up stories of Egypt or any country you please.”
“εὖ ἂν ἔχοι ... εἰ τοιοῦτον εἴη ἡ σοφία ὥστ᾽ ἐκ τοῦ πληρεστέρου εἰς τὸ κενώτερον ῥεῖν ἡμῶν...”
“Since those who rule in the city do so because they own a lot, I suppose they're unwilling to enact laws to prevent young people who've had no discipline from spending and wasting their wealth, so that by making loans to them, secured by the young people's property, and then calling those loans in, they themselves become even richer and more honored.”
“Throughout the Middle Ages the Timaeus... shaped the scientific imagination of the West, and together with Genesis challenged medieval thinkers to fashion their own "likely story" of the world's beginnings.”
Quotes via Wikiquote (CC BY-SA), each with its original source.