Freemasonry is not a religion, but religious in character. It does not require a religious affiliation nor does it teach a religious philosophy. Although the principles and moral values of Freemasonry are derived partly from religious sources, it is not a religion nor is it a substitute for religion. Every Lodge opens and closes with the benefit of prayer, and a deep and sincere reverence for Deity is manifest in all Masonic ceremonies. On the other hand, a member is never questioned about his personal religious beliefs. It is against the rules of Freemasonry to discuss theology at Lodge meetings. And even though an essential qualification to become a Freemason is the acknowledgement of a Supreme Being, the definition and nature of which is left entirely to the individual's understanding.