ἐξ ἑκουσίας
From LSJ
λογισάμενος ὅτι καὶ ἐκ νεκρῶν ἐγεῖραι δυνατὸς ὁ Θεός → in the belief that God was able to raise him up from the dead
Greek > English (Woodhouse)
Russian (Dvoretsky)
καθ' ἑκουσίαν Thuc. и ἐξ ἑκουσίας Soph. по собственной воле, добровольно.