Just as a house needs a good foundation to support it, similarly the practice of meditation needs a good foundation. This foundation is built by following the Code of Conduct. These five percepts will also help you not to harm or hurt yourself or anybody else in any way. You should agree to follow these rules because they will provide a good foundation for your meditation practice and will give you mental strength.
I also promise to do my best to follow the instructions that I will be given during my meditation course.