The Catechism of the Catholic Church defines purgatory as a "purification, so as to achieve the holiness necessary to enter the joy of heaven," which is experienced by those "who die in God’s grace and friendship, but still imperfectly purified" (CCC 1030). It notes that "this final purification of the elect . . . is entirely different from the punishment of the damned" (CCC 1031).
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.
"Build schoolhouses then for the religious education of your children as the best protest against a system of education from which religion has been excluded by law."
~ Bernard J. McQuaid, Bishop of the Diocese of Rochester; in firm command to his flock, after the failure of the State to remedy the injustice to Catholic parents who were forced to pay education taxes to support public schools detrimental to their faith.