For a single purpose were the Prophets, each and all, sent
down to earth; for this was Christ made manifest, for this did Bahá’u’lláh
raise up the call of the Lord: that the world of man should become the world of
God, this nether realm the Kingdom, this darkness light, this satanic
wickedness all the virtues of heaven—and unity, fellowship and love be won for
the whole human race, that the organic unity should reappear and the bases of
discord be destroyed and life everlasting and grace everlasting become the
harvest of mankind. ('Abdu'l-Bahá,
‘Selections from the Writings of 'Abdu'l-Bahá’)