willingly
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
English > Greek (Woodhouse)
adv.
P. and V. ἡδέως, ἀσμένως.
Voluntarily: P. and V. ἑκουσίως; see voluntarily.
Zealously: P. and V. προθύμως, σπουδῇ.