Plato, Letters 341d

πηδήσαντος ἐξαφθὲν φῶς, ἐν τῇ ψυχῇ γενόμενον αὐτὸ ἑαυτὸ ἤδη τρέφει. καίτοι τοσόνδε γε οἶδα, ὅτι γραφέντα ἢ λεχθέντα ὑπʼ ἐμοῦ βέλτιστʼ ἂν λεχθείη· καὶ μὴν ὅτι γεγραμμένα κακῶς οὐχ ἥκιστʼ ἂν ἐμὲ λυποῖ. εἰ δέ μοι ἐφαίνετο γραπτέα θʼ ἱκανῶς εἶναι πρὸς τοὺς πολλοὺς καὶ ῥητά, τί τούτου κάλλιον ἐπέπρακτʼ ἂν ἡμῖν ἐν τῷ βίῳ ἢ τοῖς τε ἀνθρώποισι μέγα ὄφελος γράψαι καὶ τὴν φύσιν εἰς φῶς

by a leaping spark, and thereafter it nourishes itself. Notwithstanding, of thus much I am certain, that the best statement of these doctrines in writing or in speech would be my own statement; and further, that if they should be badly stated in writing, it is I who would be the person most deeply pained. And if I had thought that these subjects ought to be fully stated in writing or in speech to the public, what nobler action could I have performed in my life than that of writing what is of great benefit to mankind and