Philo, On the Cherubim, 116 (33)
“Is my mind my own private possession? It is a creator of lies, a founder of wandering, of paranoia, of foolishness, a thing revealed to be the opposite of a mind in its mania and depression and eventual old age.
Is what I say my own private possession or the organs of speech? Isn’t a minor sickness enough to weaken the tongue or to sew up the mouth of even the most articulate? Doesn’t the expectation of terror strike and render most people mute?
And I am not revealed to be master even of my perception—instead, I think I am even its servant following wherever it leads to colors, shapes, sounds, smells, tastes and other corporeal things.”
ὁ δὲ νοῦς ἐμόν ἐστιν ἴδιον κτῆμα; ὁ ψευδῶν εἰκαστικός, ὁ πλάνης οἰστικός, ὁ παρανοῶν, ὁ μωραίνων, ὁ εὑρισκόμενος ἄνους ἐν ἐκστάσει καὶ μελαγχολίᾳ καὶ μακρῷ γήρᾳ; ἀλλ᾿ ὁ λόγος κτῆμα ἐμόν; ἢ τὰ φωνῆς ὄργανα; μικρὰ νόσου πρόφασις οὐ τὴν γλῶτταν ἐπήρωσεν, οὐ τὸ στόμα καὶ τῶν πάνυ λογίων ἀπέρραψεν; οὐχὶ δεινοῦ προσδοκία καταπλήξασα μυρίους ἀχανεῖς ἐποίησε; καὶ μὴν οὐδὲ τῆς αἰσθήσεως ἡγεμὼν εὑρίσκομαι, τάχα δέ που καὶ δοῦλος ἀκολουθῶν ᾗ ἂν ἄγῃ, πρὸς χρώματα, πρὸς σχήματα, πρὸς φωνάς, πρὸς ὀσμάς, πρὸς χυλούς, πρὸς τὰ ἄλλα σώματα.
This image has nothing to do with this passage. I just think it is amazing.