/summa/XP/XPII/XP_Q18:
We must now consider the effect of the keys under which head there are four points of inquiry:
(1) Whether the power of the keys extends to the remission of guilt?
(2) Whether a priest can remit sin as to the punishment?
(3) Whether a priest can bind in virtue of the power of the keys?
(4) Whether he can loose and bind according to his own judgment?