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Catholics affirm that [[God]] metes out temporal punishment even to believers (see, for example, [[Numbers 20]]:11-12). They also believe that sins are forgiven if and only if they are repented of ([[Isaiah 55:7]], [[Luke 17]]:3-4). Catholics do not treat [[sin]] as a collective entity that one can dispose of in whole; if one repents of one sin but not of another, then one is not fully repentant and thus not fully forgiven. Since God cannot behold evil ([[Habbakuk 1:13]]), Catholics claim it follows that one must be fully repentant of all sins before entering [[heaven]]. Since it is unlikely that one will be able to fully repent of all sins in this life, they argue, purgatory is offered as a place to do that, instead of eternal damnation.

[[C.S. Lewis]], Letters To Malcolm: Chiefly on Prayer, chapter 20, paragraphs 7-10, pages 108-109