Quae patefacta sunt quaerere, quae perfecta sunt retractare, et quae definita sunt convellere, quid aliud est quam de adeptis gratias non referre, et ad interdictae arboris cibum improbos appetitus mortiferae cupiditatis extendere (Letter 162, to Emperor Leo I, l)

{To seek what has been discovered, to reconsider what has been completed, and to demolish what has been defined – what else is it but to return no thanks for things gained and to indulge the unholy longings of deadly lust on the food of the forbidden tree?}