July 15

…the Laws revealed by Bahá'u'lláh in the Aqdas are, whenever practicable and not in direct conflict with the Civil Law of the land, absolutely binding on every believer or Bahá'í institution whether in the East or in the West. Certain laws, such as fasting, obligatory prayers, the consent of the parents before marriage, avoidance of alcoholic drinks, monogamy, should be regarded by all believers as universally and vitally applicable at the present time. Others have been formulated in anticipation of a state of society destined to emerge from the chaotic conditions that prevail to-day. When the Aqdas is published this matter will be further explained and elucidated. What has not been formulated in the Aqdas, in addition to matters of detail and of secondary importance arising out of the applications of the Laws already formulated by Bahá'u'lláh, will have to be enacted by the Universal House of Justice. This body can supplement but never invalidate or modify in the least degree what has already been formulated by Bahá'u'lláh. 
- Shoghi Effendi  (From a letter written on behalf of Shoghi Effendi to the National Spiritual Assembly of the United States and Canada, August 1, 1935; compilation: ‘Lights of Guidance’)