September 6

In regard to your question concerning the nature and character of Baha’i marriage. As you have rightly stated, such a marriage is conditioned upon the full approval of all four parents. Also your statement to the effect that the principle of the oneness of mankind prevents any true Baha’i from regarding race itself as a bar to union is in complete accord with the Teachings of the Faith on this point. For both Baha’u’llah and ‘Abdu’l-Baha never disapproved of the idea of inter-racial marriage, nor discouraged it. The Baha’i Teachings, indeed, by their very nature transcend all limitations imposed by race, and as such can and should never be identified with any particular school of racial philosophy. 
- Shoghi Effendi  (From a letter dated 27 January 1935 written on behalf of Shoghi Effendi to the NSA of the United States and Canada; Baha’i News, no. 90, March 1935)