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Nay, the canon law, prohibiting to depart or swerve from the rules and discipline of the Roman church, yet excepteth discretionem justitiae and so permitteth to do otherwise than the church prescribeth, if it be done cum discretione justitiae.
His code was described by Gregory the Great as "excellent in its discretion, lucid in its expression" discretione præcipuam sermone luculentam. He founded the monasteries of Montecassino and Subiaco in the beginning of the sixth century. In the ninth and tenth centuries the worst period of the Dark Ages corruption and laxity pervaded society in general, and the Benedictine monasteries especially.