"Ah, you seek meaning. Then listen to the music, not the song."
--Ambassador Kosh, Babylon 5
The Magnum Opus is the Great Work, normally attributed to Alchemy but applicable in many other disciplines, such as this one--what we refer to as "Kheb." It is a physical, mental and spiritual process to bring one from the state of blindness, a "muggle," (Harry Potter) or "sap," (The Tomorrow People) to a state of enlightenment--a much larger world view, encompassing all aspects of the physical, metaphysical and spiritual.
Even though it is a relatively simple process, it is not an EASY one! It is not something you can accomplish by just sitting around reading the information on this site. It requires real-world interaction, dedicated research, and some hard-core internal honesty and introspection, to find out the details of where you are, where you are going, who you are, and what you actually want from the process. And as one achieves degrees of enlightenment, there are both duties and responsibilities that come along with it--for what you DO, and what you FAIL TO DO.