Local matters "pertaining to the Cause" are to be referred to the Local Spiritual Assembly - 8 April 1975

The statement which you quote in the second paragraph of your letter is taken from a Tablet of ‘Abdu'l-Bahá which was addressed by Him to the friends in Tihrán at a time when, without the knowledge and permission of the Spiritual Assembly and contrary to government regulations, one of the friends undertook to print the Kitáb-i-Aqdas. The instructions of `Abdu'l-Bahá which you quote were issued on that occasion and in that context. The Universal House of Justice has pointed out that when Shoghi Effendi enumerates the functions of a Local Spiritual Assembly in "Bahá'í Administration" page 37, he indicates that the local matters to be referred to the Local Spiritual Assembly are those "pertaining to the Cause". This does not mean, of course, that personal problems may not be referred to Bahá'í Assemblies. The Local Spiritual Assembly, however, is not the only institution or agency to which the friends may turn for consultation on personal matters. Such consultation could be held with members of one's family, with friends, or with experts. For example in one of His Tablets `Abdu'l-Bahá envisages the possibility of experts in one profession conferring together. 

- The Universal House of Justice  (From a letter written on behalf of the Universal House of Justice, 8 April 1975 to an individual believer ; The Compilation of Compilations, vol. I, Consultation)

The reason why believers are “commanded to shun Covenant-breakers” - 23 March 1975

. . . The believers are commanded to shun Covenant-breakers for the same reason as healthy people do not associate with a person suffering from a serious contagious illness. A contagiously sick person cannot catch health from a thousand healthy people, but, on the contrary, he can infect them with his illness. Therefore such a person is quarantined and only those few people qualified to attend him do so. . . . Then, if he proves adamant he is free to go his way, but the Bahá'ís must cease to have any association with him until such time as he repents when, of course, he can be accepted back into the community. 

- The Universal House of Justice  (Letter dated March 23, 1975, to an individual believer; compilation: Developing Distinctive Baha’i Communities, NSA of USA, 1998 edition)

Conditions under which a person becomes a Covenant-breaker - 23 March 1975

Every Bahá'í is at liberty, nay is urged, to freely express his opinion and his understanding of the Teachings, but all this is in a totally different category from that of a Bahá'í who opposes the clear Teachings of Bahá'u'lláh or who asserts his own opinion as an authoritative and correct interpretation of the teachings, and attacks or opposes the very Institutions which Bahá'u'lláh has created to protect His Covenant. When a person declares his acceptance of Bahá'u'lláh as a Manifestation of God he becomes a party to the Covenant and accepts the totality of His Revelation. If he then turns round and attacks Bahá'u'lláh or the Central Institution of the Faith he violates the Covenant. If this happens every effort is made to help that person to see the illogicality and error of his actions, but if he persists he must, in accordance with the instructions of Bahá'u'lláh Himself, be shunned as a Covenant-breaker. 

- The Universal House of Justice (From a letter dated March 23, 1975 to an individual believer; compilation: Developing Distinctive Baha’i Communities, NSA of USA, 1998 edition)

Treatment of human body for medical research - 18 March 1975

To your fourth questions, a Bahá'í when dissecting a human body for the purposes of medical study, should keep in mind that since the body was once the temple of the spirit it must be treated with respect even though there is no further connection between the two. 

- The Universal House of Justice  (From a letter dated March 18, 1975 to an individual believer; compilation: ‘Lights of Guidance’)