Works of Plato
Plato referenced both by Jerome (as an example of a seeker of learning who traveled the world) and by Lacordaire (as the paradigm of passionate philosophy, to which Paul is compared).
Pope Clement VIII, Jerome's Prefaces, On Worship
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II. JEROME TO PAULINUS.
— Jerome cites Plato's arduous journeys to Egypt and Magna Graecia as an example of dedication to learning
"Plato most laboriously traveled through Egypt, and to Archytas of Tarentum, and that coast of Italy which was once called Magna Graecia"
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ON THE WORSHIP OF JESUS CHRIST IN THE SCRIPTURES.
— Lacordaire compares Paul to Plato in passionate eloquence
"he is at once more rigorous than Aristotle and more passionate than Plato"