" believe no happiness can be found worthy to be compared with that of a soul in Purgatory except that of the saints in Paradise. And day by day this happiness grows as God flows into these souls, more and more as the hindrance to His entrance is consumed. Sin's rust is the hindrance, and the fire burns the rust away so that more and more the soul opens itself up to the divine inflowing. "

― Catherine of Genoa , A Treatise on Purgatory