Let’s say that a Catholic has committed a bunch of mortal sins over time and hasn’t gone to Confession in a long time because he hasn’t felt like it or because he’s afraid to go… then, one day, seemingly out of the blue and for no apparent reason, he wakes up and says, “You know, I could really go for Confession today. I’d like to receive the Eucharist again.” THAT is the Holy Spirit working within him. He doesn’t feel all that different, just that today he has a practical desire for reconciliation for that wasn’t there yesterday. But, in reality, this is the Holy Spirit freely bestowing upon him an insanely huge, glorious, life-saving gift. Only later will our man, hopefully, realize this, when he looks back “from above” at his previously sorrowful and desperate state. He will know then that this event, which didn’t seem very special at the time, was a God-given miracle.