"The Holy Ghost converts [us] from carnality to spirituality. It cleanses, heals, and purifies the soul. . . . . Faith in the Lord Jesus Christ, repentance, and water baptism are all preliminary and prerequisite to it, but [the baptism of fire] is the consummation. To receive [this baptism of fire] is to have one's garments washed in the atoning blood of Jesus Christ."

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I do not doubt that all those who have received Baptism anywhere and from whomever do have Baptism, as long as it was consecrated with the words of the Gospel and they received it without pretence on their part and with some degree of faith. However, it would not avail them for their spiritual salvation if they were lacking in that charity by which they might be implanted in the Catholic Church.

— Saint Augustine