The doctrine of hell is so frightening that numerous heretical sects end up denying the reality of an eternal hell. The Unitarian-Universalists, the Seventh-day Adventists, the Jehovah’s Witnesses, the Christadelphians, the Christian Scientists, the Religious Scientists, the New Agers, and the Mormons—all have rejected or modified the doctrine of hell so radically that it is no longer a serious threat. In recent decades, this decay has even invaded mainstream Evangelicalism, and a number of major Evangelical figures have advocated the view that there is no eternal hell—the wicked will simply be annihilated.
But the eternal nature of hell is stressed in the New Testament. For example, in Mark 9:47–48 Jesus warns us, "t is better for you to enter the kingdom of God with one eye than with two eyes to be thrown into hell, where the worm does not die, and the fire is not quenched." And in Revelation 14:11, we read: "And the smoke of their torment goes up for ever and ever; and they have no rest, day or night, these worshipers of the beast and its image, and whoever receives the mark of its name."
Hell is not just a theoretical possibility. Jesus warns us that real people go there. He says, "Enter by the narrow gate; for the gate is wide and the way is easy, that leads to destruction, and those who enter by it are many. For the gate is narrow and the way is hard, that leads to life, and those who find it are few" (Matt. 7:13–14).
The Catechism of the Catholic Church states: "The teaching of the Church affirms the existence of hell and its eternity. Immediately after death the souls of those who die in a state of mortal sin descend into hell, where they suffer the punishments of hell, ‘eternal fire.’ The chief punishment of hell is eternal separation from God, in whom alone man can possess the life and happiness for which he was created and for which he longs" (CCC 1035).
In his 1994 book, Crossing the Threshold of Hope, Pope John Paul II wrote that too often "preachers, catechists, teachers . . . no longer have the courage to preach the threat of hell" (p. 183).
Concerning the reality of hell, the pope says, "In point of fact, the ancient councils rejected the theory . . . according to which the world would be regenerated after destruction, and every creature would be saved; a theory which abolished hell. . . . [T]he words of Christ are unequivocal. In Matthew’s Gospel he speaks clearly of those who will go to eternal punishment (cf. Matt. 25:46). [But] who will these be? The Church has never made any pronouncement in this regard" (pp. 185–6).
Thus the issue that some will go to hell is decided, but the issue of who in particular will go to hell is undecided.
The early Church Fathers were also absolutely firm on the reality of an eternal hell, as the following quotes show........<SNIP>