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The problem is that this “doctrinal grid,” which refers to an eternal, conscious punishment of the wicked in hell, is itself not a metaphor taken too seriously but part of the fabric of the biblical warnings about judgment. Daniel contrasts “everlasting life” with “everlasting contempt” (Dan 12:2), and Paul similarly contrasts “death” with “eternal life” (Rom 6:23). The final state is described as “eternal fire” (Matt 18:8; 25:41; Jude 7), and “eternal judgment” (Heb 6:2). Concerning the destruction of God’s enemies, John says that the “smoke of their torment will rise for ever and ever” (Rev 14:11; cf. 19:3). It seems, then, that conditionalists disparage those scriptural passages that speak clearly of a never-ending state for those who reject the worship of the true God and the way of humanness that follows from it.27 Eternal punishment is not injurious to God’s justice and love; rather, it upholds it, as Robert Gundry writes: The NT doesn’t put forward eternal punishment of the wicked as a doctrine to be defended because it casts suspicion on God’s justice and love. To the contrary, the NT puts forward eternal punishment as right, even obviously right. It wouldn’t be right of God not to punish the wicked, so that the doctrine supports rather than subverts his justice and love. It shows that he keeps faith with the righteous, that he loves them enough to vindicate them, that he rules according to moral and religious standards that really count, that moral and religious behavior has consequences, that wickedness gets punished as well as righteousness rewarded, and that the eternality of punishment as well as of reward invests the moral and religious behavior of human beings with ultimate significance. We’re not playing games. In short, the doctrine of eternal punishment defends God’s justice and love and supplies an answer to the problem of moral and religious evil rather than contributing to the problem.28
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Michael F. Bird (Evangelical Theology: A Biblical and Systematic Introduction)