A True Story — Lucian of Samosata (Harmon) — Lucian's satirical proto-science-fiction voyage to the edges of the world, in A. M. Harmon's 1913 Loeb Classical Library translation, with his scholarly notes.
Dialogues of Plato — Jowett — Twenty-three dialogues of Plato in Benjamin Jowett's Oxford translation — the Apology, Crito, Phaedo, Phaedrus, Symposium, Gorgias, Meno, Ion, Republic extracts, Timaeus, Theaetetus, Parmenides, Sophist, Statesman, Philebus, and others.
Golden Verses of Pythagoras — Firth — The Golden Verses of Pythagoras and other Pythagorean fragments — the foundational ethical text of the Pythagorean school, with Hierocles' commentary and other fragments. Translated by Florence M. Firth (1904).
The Discourses of Epictetus — The Discourses of Epictetus, Books III and IV — recorded by Arrian of Nicomedia; translated by W. A. Oldfather. Loeb Classical Library, 1928. Practical Stoic philosophy on freedom, desire, discipline of assent, and the examined life.
The First Philosophers of Greece — Arthur Fairbanks — Arthur Fairbanks collects, edits, and translates the surviving fragments and ancient testimony for the Presocratic philosophers from Thales through Anaxagoras.
The History of Herodotus Vol. I (Books I–IV) — Macaulay — The complete text of Books I through IV of Herodotus's Histories — Croesus, Cyrus, and the rise of Persia, and the customs of Egypt and Scythia — in G. C. Macaulay's 1890 English translation.
The History of Herodotus Vol. II (Books V–IX) — Macaulay — The complete text of Books V through IX of Herodotus's Histories — the Ionian revolt and the Persian invasions of Greece, through Marathon, Thermopylae, Salamis, Plataea, and Mycale — in G. C. Macaulay's 1890 English translation.
The Meditations of Marcus Aurelius — The private philosophical notebooks of the Roman Emperor Marcus Aurelius — twelve books of Stoic reflection on duty, impermanence, reason, and the examined life, written in Greek during military campaigns on the northern frontier, circa AD 161–180.
The Poetics of Aristotle — Butcher — Aristotle's founding work of literary criticism on epic and tragic poetry, in S. H. Butcher's 1902 translation.
The Politics of Aristotle — Jowett — Aristotle's complete eight-book treatise on the best forms and constitutions of the city-state, in Benjamin Jowett's 1885 Oxford translation.