Hippolytus — Refutation of All Heresies 10.33

The human being who was made was a self-determining living creature (αὐτεξούσιον) — not a ruling mind holding all things by thought and power, but a servant, with opposites present in him. Because he is self-determining, he generates evil, which comes about as an accident: it is nothing unless you do it. Evil is named in the willing and thinking of something bad; it was not from the beginning, but comes on later.

Because he is self-determining, a law was set by God — not in vain. If man did not have the power to will and not to will, why was a law set at all? Law is not laid down for an irrational animal — bit and whip are — but for a human being: command and penalty for doing what is ordered and for not doing it.