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 (Quoted by Shoghi Effendi in ‘The World Order of Baha'u'llah’)