Will and Nature

Το, Οὐ δύναται ὁ Υἱὸς ποιεῖν ἀφ' ἑαυτοῦ οὐδὲν, ἐὰν μή τι βλέπῃ τὸν Πατέρα ποιοῦντα, οὐκ ἀσθενείας σημεῖον, ἀλλὰ τοῦ μὴ ἐνδέχεσθαι, ἄλλην Πατρὸς καὶ ἑτέραν Υίοῦ εἶναι τὴν βούλνσιν. Εἰ δὲ ἂ ποιεῖ ὁ Πατὴρ ὁρᾷ ὁ Υἰὸς, ποιεῖ δὲ ὁ Πατὴρ βουλευόμενος· βλέπει ἄρα ὁ Υἱὸς καὶ αὐτὰ τοῦ Πατὴρ βουλεύματα· ἐπειδή ποιησις Θεοῦ, αὐτή ἐστιν ἡ βούλησις. Εἰ δὲ βλέπει βουλευόμενον, καὶ κοινωνεῖ τῆς βουλήσεως, δηλονότι καὶ φύσεως· μία ἄρα οὐσία Πατρὸς καὶ Υἱοῦ, ὥσπερ θέλησις. Ἅγιος Ἰσίδωρος Του Πηλουσιώτου, Βιβλίον Πρῶτον, Ἐπιστολή ΤΝΓ' , Συμφορῳ Source: Migne PG 78.383c

'The Son is not able to do anything by Himself, if He does not first see the Father doing it,' 1 should by no means be given a foolish meaning, that it really indicates that the will of the Father is one thing and the will of the Son something else, as if what the Father does, the Son sees and then He does what the Father wills. For understand that the Son wills the same as the Father, since this is the Divine operation that the will is the same. And so if one sees this will and the commonality of the willing, clear is the nature, that the being of the Father and Son is one, as with the will. Saint Isidore of Pelusium, Book 1, Letter 353, To Symphorus 1 Jn 5.19