Indulgance is more about punishment than forgiveness.
Others can probably explain it better than this, but here goes:
I’m playing baseball in the yard with my friends. Dad told me not to, rather to go to the park to play so as not to break a window. But here we are, playing ball in the yard. I make an errant throw and break a window. Oops.
Dad finds out. Two things happen:
- He knows I’m a stupid kid and didn’t listen to him. But he forgives me anyway.
- Even though he forgave me, he still punishes me. I get grounded for two weeks. During that grounding, I am a model citizen, offering to do stuff around the house without being asked, helping my sister with her homework, etc, and I am doing this stuff not just to appear good but because I want to please Dad.
Dad reduces my grounding to one week.
Confession/Reconciliation is sorta like #1. I tell him, yes, I screwed up and broke the window, and he forgives me.
An Indulgance is sorta like #2. He has already forgiven me, but I still have to face the music, pay the piper, do time, whatever we want to call it. We are punished for our sin, purged of our uncleanliness. Indulgances are ***sorta ***like “time off for good behavior”.
Maybe like the “presoak” setting on the U-do car washes.

It’s like getting a “pre-cleaning” before the big wash of purgatory.
However, we must be careful as not viewing indulgances like “get out of jail free” cards. Our hearts must be right. In seeking an indulgence, we must be truly sorry for our sin, strive for perfection and not just be interested in lessening our purgation.