The conversion of the soul usually takes time, for it's an awakening process that involves much learning by the heart. It shows how tenaciously an individual can isolate himself in the castle he's built around himself, so to speak, attempting to ward off any penetration into his interior. Unfortunately, he also makes himself impervious to God who only wants to illuminate him and save him from the true perils to his soul. Anytime a sinner wakes up, repents, and returns to God, the whole heaven rejoices. A soul who does not repent becomes not only a lost one, but also a great joy killer.