It is better not to read books by…

It is better not to read books by Covenant Breakers because they are haters of the Light, sufferers from a spiritual leprosy, so to speak. But books by well meaning yet unenlightened enemies of the Cause can be read so as to refute their charges. (From a letter dated 19 March 1945 written on behalf of the Guardian to an individual believer; compilation on ‘Writings of the Covenant-breakers and other Enemies of the Faith’, prepared by the Research department of the Universal House of Justice)

As to the passage Arabic no 13 of…

As to the passage Arabic no. 13 of the Arabic “Hidden Words”: that which Bahá’u’lláh declares we can find abiding within us is the power of the Divine Spirit, the reflection of the light of His Revelation. This reflection of the Divine Spirit, however, can in no way be compared to the Revelation which God discloses to His Prophets and Messengers. The similarity in the terminology should not confuse this distinction, which is most fundamental.
(From a letter dated 15 November 1935 written on behalf of Shoghi Effendi to two believers)

Compilations : A Compilation of Writings about the Hidden Words