Why Is Righteousness a ‘Breastplate’?
Fr. Hugh Barbour, O. Praem. | 4/05/2018
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What does it mean to put on the breastplate of righteousness?

St. Thomas teaches that the image of the breastplate is used because righteousness or justice protects the other virtues as a breastplate protects the body. So it is a characterization of justice as a universal virtue underlying all the other virtues.