Here is the article that was mentioned earlier: The New Gospel Principles Manual A good rule of thumb when teaching is definitely to stick with the text. In this case the text is the manual, so I wouldn't intentionally stray too far away from it. However, another (and better) rule of thumb is to follow the spirit as you teach. The point of these lessons is not for you to stand up and read the book to your brothers. They can do that on their own. The point is for them (and you) to have a spiritual experience and to learn and gain a deeper testimony. Always prepare your lesson prayerfully, as that will help you to come up with inspired questions and foster discussion that will benefit your students. Don't be afraid of getting off track if that's where the spirit of discussion takes it. Ask follow-up questions to make a person's thoughts personal. For example, if a brother says, "Heavenly Father created all things spiritually before physically," you could ask, "what does it mean to you to have that knowledge?" The comments that a person makes during these lessons are usually broad and basic. You as the teacher can help turn that broad and basic into personal and specific by helping them dig a little deeper--without getting too personal and making it uncomfortable. This is just personal preference here, but whenever I am asked to teach a lesson or give a talk, I find it helpful to load it up with relevant scriptures. The manual usually lists some, and often quotes them right in the book so that it doesn't have to take five minutes to get someone to read one verse of scripture. But being the basic gospel lessons that these are, the scriptures are generally basic as well. If your class is full of spiritually-mature (I.E. brothers who have been in the church for a while or otherwise have strong testimonies) people, I don't see anything in the book or in the article that has been referenced prohibiting you from looking up more scriptures to back up the point you are making. In fact, I think new and old members alike could benefit from opening their scriptures more often in church. What I am saying, in short, is that there is no better teacher than the spirit and there is no better textbook than the scriptures. The manual should be your guide in creating a lesson tailored to the people whom you are called to teach. The lessons are the basic foundations of the gospel presented in a simple manner, but this does not mean that the spiritual experiences of your brethren need to be basic and simple. Just pray like crazy and follow the spirit. You'll do fine