In every Dispensation the light of Divine Guidance has been
focussed upon one central theme.... In this wondrous Revelation, this glorious
century, the foundation of the Faith of God and the distinguishing feature of
His Law is the consciousness of the Oneness of Mankind.
(‘Abdu’l-Baha, cited by
Shoghi Effendi in ‘The World Order of Baha'u'llah’)