Addendum for pilgrim:
What you are doing here, pilgrim, is simply regurgitating your church's very bad eisegesis of this verse. Nowhere does that verse mention treasury of merits of either Jesus or the saint, to be used to obtain remission of temporal punishments for sins. I see zero evidence whatsoever in this verse for the teaching of indulgences. So, this teaching is entirely made up of whole cloth by your church.
Jesus paid not only for the guilt of our sins, on the cross, but also the eternal punishment they would merit.