Chastity, or cleanness of heart, holds a glorious and distinguished place among the virtues, because she, alone, enables man to see God; hence Truth itself said, 'Blessed are the clean of heart, for they shall see God.'
... at the beginning of the human race the woman was made of a rib taken from the side of the man while he slept; for it seemed fit that even then Christ and His Church should be foreshadowed in this event. For that sleep of the man was the death of Christ, whose side, as He hung lifeless upon the Cross, was pierced with a spear, and there flowed from it blood and water, and these we know to be the sacraments by which the Church is built up.
You (God) have not only commanded continence, that is, from what things we are to restrain our love, but also justice, that is, on what we are to bestow our love.