“29. According to Plato, soul is a self-moving incorporeal substance. According to the Stoics, however, it is a subtle body moving out of itself according to seminal principles, while according to Aristotle, it is the actuality of a natural instrumental body potentially having life. Alternatively, soul is pneuma distributed through the whole body, through which we live and reason and act by means of the other senses, the body being its servant.*

30. Body is magnitude three times extended, having in itself height, depth and breadth.** Or, it is magnitude composed of three dimensions.”

κθʹ. ψυχή ἐστιν οὐσία ἀσώματος, αὐτοκίνητος κατὰ Πλάτωνα. κατὰ δὲ τοὺς Στωϊκοὺς σῶμα λεπτομερὲς ἐξ ἑαυτοῦ κινούμενον κατὰ σπερματικοὺς λόγους. κατὰ δὲ τὸν Ἀριστοτέλη ἐντελέχεια σώματος φυσικοῦ ὀργανικοῦ δυνάμει ζωὴν ἔχοντος. ἄλλως. ψυχή ἐστι πνεῦμα παρεσπαρμένον ἐν ὅλῳ τῷ σώματι δι' οὗ ζῶμεν καὶ λογιζόμεθα καὶ ταῖς λοιπαῖς αἰσθήσεσιν ἐνεργοῦμεν ὑπηρετοῦντος τοῦ σώματος.

λʹ. σῶμά ἐστι μέγεθος τριχῇ διάστατον ἔχον ἐν ἑαυτῷ μῆκος, βάθος, πλάτος. ἢ μέγεθος ἐκ τριῶν διαστημάτων συνεστηκός.

[Galen], Medical Definitions 29 and 30, 19.355–356 K

*cf. Anonymus Londinensis:

“‘Soul’ is said in three ways: that which pervades the whole body, and the rational part, and further the entrecheia (i.e., ἐντελέχεια, probably).”

ψυχὴ δὲ λέγεται τριχῶς·
[ἥ τε] τῶι ὅλωι σώματι παρεσπαρ-
μ̣ένη καὶ τὸ μόριον τὸ λογιστικὸν
[κ]αὶ ἔτι ἡ ἐντρέχεια. * καὶ τῆς μ(ὲν) ἐντρε-
[χ]είας ἐπὶ τοῦ παρόντος οὐ χρῄζομεν,
[τ]ῶν δὲ ἄλλων δύο σημαινομένων,
[κα]ὶ μᾶλλον το̣ῦ λο̣γιστ̣ικοῦ.

Anonymus Londinensis I,21-24

**Cf. Apollodorus ap. Diogenes Laertius:

“Body is defined by Apollodorus in his Physics as that which is extended in three dimensions, length, breadth, and depth. This is also called solid body.”

σῶμα δ’ ἐστίν, ὥς φησιν Ἀπολλόδωρος ἐν τῇ Φυσικῇ, τὸ τριχῆ διαστατόν, εἰς μῆκος, εἰς πλάτος, εἰς βάθος· τοῦτο δὲ καὶ στερεὸν σῶμα καλεῖται.

Diog. Laert. 7.175