Lord’s Day 36—Questions and Answers #99 and #100. The theme of God’s name is very prominent throughout the Bible. Why is that and why is God’s name so important? In this sermon, we will learn what it means when the Third Commandment warns that we should not take God’s name in vain; under three main points: 1. The Vain Use of His Name Forbidden. 2. The Proper Use of His Name Commanded. 3. The Sacred Use of His Name Vindicated.