This lesson is one of the most important lessons in the entire Immortality Course. It covers biophysical transmutation and illumination of the body, mind and soul through the absorption of solar energy. The lesson covers a straight-forward yet effective method of using full-spectrum solar energy, which enables one to harmonize and recharge the body with life energy and also invoke the unlimited powers of the mind very easily. Additionally, practices taught herein facilitate the liberation of the student from the threefold sufferings of humanity: mental illnesses, physical illnesses and spiritual ignorance.