A Declaration of Oneness for the Human Family,” drafted by Robert Muller and circulated by the Temple of Understanding, did not ignite the global interfaith response that other foundational documents have inspired. But it underlined and helped articulate an assumption that drives all interfaith endeavour, that there is a unique, connective oneness to the human family, and that every member of the family deserves respect, dignity, and opportunity. Marcus Braybrooke, who participated in the ‘Oneness’ discussions over the years, tells how the idea developed.