"The supreme and most important happening in the human world,” ‘Abdu’l-Bahá states, “is the Manifestation of God and the descent of the law of God.” Bahá’u’lláh explains that God has enjoined upon each of us twin duties: to recognize the Manifestation of God, and, for those who have done so, to observe His laws and ordinances “These twin duties,” He writes, “are inseparable. Neither is acceptable without the other.”
The Bahá’í Writings describe the existence of two complementary aspects of divine law. The first refers to the universal, unchangeable spiritual laws which are animated by, and reflected in, all of God’s religions. The other concerns the laws which serve to order humanity’s social and spiritual life—laws which change according to the particular conditions and circumstances of the time.
Each Manifestation—as a Divine Educator—upholds the universal law of God, and brings a new set of laws governing the spiritual and social aspects of humanity's life during the next stage of its evolution. The ultimate purpose of the appearance of the Manifestations of God, ‘Abdu’l-Bahá states, is “to illumine the world of humanity, to render the earthly world celestial, to make the human kingdom a realm of angels, to unite the hearts, to enkindle the light of love in human souls, so that such souls might become independent, attaining complete unity and fellowship, turning to God, entering into the divine Kingdom, receiving the bounties and bestowals of God and partaking of the manna from heaven.”