There is no error so fatal in its consequences as the loss of eternal salvation. Other errors may be repaired; if a person lose a situation, he may perhaps in time regain it; if he lose his goods, he may replace them, but if he lose his soul, he has no remedy nor hope of redemption. He can die but once; and if that once his soul be lost, it must be lost forever, and no power can save it for all eternity.
–Saint Alphonsus Liguori (1696-1787)