“Sin is called… ‘a stain on the soul.’ A stain is a blot or ugly mark which destroys what is bright and comely. A stain is caused by contact with soiling and unsuitable things. Sin dims or blots out the brightness of perfected human nature; it blots out the wisdom and grace of God in the soul. It is therefore a stain upon the soul. We speak here of grave sin, not of the actual sin which is called venial. A stain remains after the contact that caused it has ceased. So also the stain of serious sin remains in the soul after the act of sin has been completed. This stain is not removed except by a new act of returning by recovered grace to the unsmirched beauty of the soul.” (Msgr. Paul J. Glenn, A Tour of the Summa, p. 162).
St. Athanasius: “When he extended his hands upon the cross, he overthrew ‘the ruler of the power of the air, who is at work in the sons of disobedience’ (Eph 2:2) and cleared the way to heaven for us.” (Letter 40 to Adelphius)
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