12:31 Now is the judgment of this world. By His coming death, Jesus will end the power of sin over Adam’s race, judging and condemning it.

the ruler of this world. Satan (cf. 14:30; 16:11; 2 Cor. 4:4; Eph. 2:2; 1 John 4:4; 5:19). Satan has power in fact, not by right. When God destroys Satan’s power, He is not violating his rights, or breaking any agreement made with him.