One universal Cause, one common Faith.

We behold it, in this day, at the mercy of rulers so drunk with pride that they
cannot discern clearly their own best advantage, much less recognize a Revelation so bewildering and challenging as this. And whenever any one of them hath striven to improve its condition, his motive hath been his own gain, whether confessedly so or not; and the unworthiness of this motive hath limited his power to heal or cure.
That which the Lord hath ordained as the sovereign remedy and mightiest instrument for the healing of all the world is the union of all its peoples in one universal Cause, one common Faith. This can in no wise be achieved except through the power of a skilled, an all-powerful and inspired Physician. This, verily, is the truth, and all else naught but error.

Gleanings From the Writings of Bahá’u’lláh