The Roman emperor, and Stoic philosopher, Marcus Aurelius wrote in his personal notes on Stoic philosophy:
A fine reflection from Plato. One who would converse about human beings should look on all things earthly as though from some point far above, upon herds, armies, and agriculture, marriages and divorces, births and deaths, the clamour of law courts, deserted wastes, alien peoples of every kind, festivals, lamentations, and markets [agoras], this intermixture of everything and ordered combination of opposites. — Meditations, 7. 48
View of the Acropolis from below, overlooking the ancient agora
This looks like it’s intended as a quote from Socrates in Plato’s writings but, incidentally, it doesn’t appear in any of the surviving Platonic dialogues.