John 12:31

Now (i.e. within a few days) is the judgment (or, a judgment) of this world] i.e. of the persons in it. Christ's death followed by His Resurrection is a 'judgment,' because it is a deliberate challenge to mankind to accept Him as the Divine Redeemer of the world Henceforth men must take sides for and against Christ. To accept Him is to accept eternal life: to reject Him is to be self-condemned.

Now shall the prince of this world (i.e. Satan) be cast out] i.e. deposed by the power of Christ's Death and Resurrection from his usurped dominion over the human race. 'The prince of the world' (i.e. of the Gentile world) was a recognised rabbinical title of Satan.