Sin has its origin in the will, which decides (against reason) for a "changeable good". Since, however, the will also moves the other powers of man, sin has its seat in these too. By choosing such a lower good as its end, the will is misled by self-love, so that this works as cause in every sin. God is not the cause of sin since, on the contrary, he draws all things to himself; but from another side, God is the cause of all things, so he is efficacious also in sin as "actio" but not as "ens." The devil is not directly the cause of sin, but he incites the imagination and the sensuous impulse of man (as men or things may also do).