Whether an indulgence avails the person who grants it?

Objections

Objection 1 : It would seem that an indulgence does not avail him who grants it. For the granting of an indulgence belongs to jurisdiction. Now no one can exercise jurisdiction on himself. thus no one can excommunicate himself. Therefore no one can participate in an indulgence granted by himself.
Objection 2 : Further, if this were possible, he who grants an indulgence might gain the remission of the punishment of all his sins for some small deed, so that he would sin with impunity, which seems senseless.
Objection 3 : Further, to grant indulgences and to excommunicate belong to the same power. Now a man cannot excommunicate himself. Therefore he cannot share in the indulgence of which he is the grantor.