The Tablet of the Gems of Unity concisely encapsulates, with remarkable force and concision, the essence of Bahá’í theology. In it, Bahá’u’lláh first establishes the existence of God by arguing in favor of the principle of causality, the ultimate contingency of the universe, and thus the constant dependence of the world on a Reality, being God, that is its necessarily existent and self-subsistent Creator and Sustainer.