I used to be teacher at a college. Usually, I set the passing score at 60%. If a student scored a 59, should I fail him? You need a cutoff, but how strictly should I adhere to it? What about the student who would have done better if some unfortunate event hadn't happened to prevent him from studying for the exam? Shouldn't the student who tried really hard to pass be given special consideration? These were the questions I asked myself. I believe that God's mercy is flexible. We already know that he loves us and wants to save as many of us as he can. Many of us are basically imperfect, but not exactly evil. He'll look for any little merit we have in order to save us. The existence of purgatory is a sign of his great mercy. Repentance ensures that we'll get into heaven. To me, the best policy is to love and serve the Lord to the max and we won't need to be concerned about how he's going to judge us anymore.