Everything that is capable of turning back upon itself is incorporeal.
Πᾶν τὸ πρὸς ἑαυτὸ ἐπιστρεπτικὸν ἀσώματόν ἐστιν.

Philosophers
Porphyry
Born c. 234 in Tyre, Porphyry was a Phoenician Neoplatonist who edited Plotinus into the Enneads. His logic primer Isagoge was the standard textbook of Aristotelian logic in medieval Europe and the Islamic world.
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Porphyry's Other Quotes
Related Quotes
People seek retreats in the country, by the sea, in the mountains — but you can retire into yourself whenever you choose.
-- Marcus Aurelius
When the soul turns toward itself, it turns at the same time toward the divine.
-- Iamblichus
Every unity either participates in the One or is itself the One.
-- Proclus
The soul is forever the mover of itself.
-- Proclus
All is number.
-- Pythagoras
The unexamined life is not worth living.
-- Socrates