The phenomenal effects of His Covenant ...

With the setting of the Sun of Baha, the Moon of His Covenant rose in reflected glory, lifting the darkness of a night of despair, and lighting the path to the unity of all humankind. In the fullness of its radiance stands the magnetic Figure of ‘Abdu’l-Bahá, the beloved Son Whom Bahá’u'lláh designated as the Interpreter of His Word and Executive of His authority, and Whom He appointed the Centre of His Covenant, an office without parallel in all religious history. …
As a result of the phenomenal effects of His Covenant, a world community has been raised up on an “unassailable foundation”. The entire system of the Administrative Order originated by Bahá’u'lláh in His Most Holy Book has been erected. A vigorous network of local, national, continental and international institutions functions in exemplary harmony throughout the planet. Vitalized and nurtured by His stupendous Revelation, watered by the precious blood of countless martyrs, and tended by the loving care of unnumbered, devoted servants, the Tree of the Cause has, in these hundred years, grown mightily, has put forth its far-stretching branches and borne its first and plentiful fruit.

The Universal House of Justice, 1992 May 29, Centenary Tribute to Baha’u'llah