Edward Joseph Hanna,
Catholic Encyclopedia
(1913)
“ Contrition takes away all stain of guilt, while attrition prepares the way for the real remission of sin in the sacrament. Theologians had recognized the distinction between contrition and attrition even before William of Paris, but neither Alexander of Hales nor Albert, the master of Aquinas, advanced much beyond the teaching of Peter Lombard. Both seemingly insisted on real contrition before absolution, and both also held that such contrition in reality took away mortal sin. ”
