The document discusses the third of six basic principles of spiritual practice - moving from gross to subtle. It explains that 'gross' refers to practices that are shallow, superficial, or limited, while 'subtle' refers to practices that are more intangible or connected to the Supreme God Principle. It provides examples to illustrate moving along the continuum from gross to more subtle practices, such as changing the focus of prayer from formal words to heartfelt feelings, or changing the focus of chanting from aloud to mentally without words. The principle suggests that as spiritual practice evolves, it should incorporate increasingly subtle and internal aspects to fully embrace the Supreme God Principle.