Those who are bent on making their own unauthorized changes to the liturgy or who otherwise promote or tolerate various liturgical abuses often fail to appreciate how such an endeavor can constitute grave sin. I know this because some have accused me of making a mountain out of a molehill for my opposition to various liturgical abuses. Dr. Germain Grisez explains: "There are many reasons why it is wrong for priests intentionally to make unauthorized liturgical changes. Two are especially important. First, such changes sometimes embody or imply deviations from Catholic faith; even when they do not, they often omit...