Lord’s Day 43—Question and Answer #112. How important is it to be truthful? The Ninth Commandment deals with the issue of truth, and the Catechism focuses on the vast context of this commandment, the spirituality of the law; under three headings: 1. We May Not Bear False Witness Against Our Neighbor. 2. We Must Avoid All Manner of Dishonesty. 3. We Must Love and Promote the Truth.