While there's a bit of a joke in that title, there's also some truth. If we're going to worship God, we need to know the disposition of our own hearts. Just as Christ gave Himself for us, offered His body in sacrifice for us, so we are called to make a sacrifice of ourselves whenever we worship. This might mean putting aside our own stylistic preferences, or being obedient when it would be easier to do our own thing, or simply setting aside the time required to attend Mass. No matter what, we all have a sacrifice that we can make for God's glory!
