‘The justice of God’s final judgment, which Jesus will administer, according to the Gospel, lies in two things: first, the fact that what people receive is not only what they deserve but that they have in effect already chosen — namely, to be forever without God and therefore without any of the good that He gives; second, the fact that the sentence is proportioned to the knowledge of God’s Word, work and will that was actually disregarded (cf. Luke 12:42-48; Rom. 1:18-20, 32; 2:4, 12-15). Hell, according to the Gospel, is not immoral ferocity but moral retribution, and discussions of its length for its inmates must proceed within that frame.’

J.I. Packer, ‘Evangelical Annihilationism in Review‘