I went to vigil Mass today. The first reading is taken from Genesis 2. Adam and Eve disobeyed God and ate the fruit from the tree of the knowledge of good and evil. So we all now have a conscience. The thing is that as we sin more and more, our conscience gets muddy and dull. But if we submit ourselves to God, the Holy Spirit will wash it clean and sharpen it to the point that we don't ever wish to offend God anymore. With a clear conscience, we can bask in the glorious light of God, enjoying his presence.