Bahá'u'lláh declared, "So powerful is the light of unity, that it can illuminate the whole earth." We, verily," He further stated, "have come to unite and weld together all that dwell on earth." Bahá'u'lláh made the oneness of humankind the central principle and goal of His Faith, an emphasis that implies the organic and spiritual unity of the whole body of nations and signalizes the "coming of age of the entire human race.
Bahá'u'lláh's Covenant guarantees both unity of understanding of His Faith's fundamental doctrines and actualization of that unity in the Bahá'í community's spiritual and social development. It is distinguished by its provision for authentic interpretation of the sacred texts and for an authorized system of administration, at the apex of which is an elected legislative body empowered to supplement the laws revealed by Bahá'u'lláh.
This Covenant is the most remarkable feature of His Revelation, for it is designed, unlike any religious system of the past, to preserve the unity of all humanity through the organic workings of a social order based on spiritual principles. "So firm and mighty" is this Covenant, Bahá'u'lláh's son `Abdu'l-Bahá has affirmed, "that from the beginning of time until the present day, no religious Dispensation hath produced its like.