The advice that Shoghi Effendi gave you regarding the division of your time between serving the Cause and attending to your other duties was also given to many other friends both by Bahá'u'lláh and the Master. It is a compromise between the two verses of the "Aqdas", one making it incumbent upon every Bahá'í to serve the promotion of the Faith and the other that every soul should be occupied in some form of occupation that will benefit society. In one of His Tablets Bahá'u'lláh says that the highest form of detachment in this day is to be occupied with some profession and be self-supporting. A good Bahá'í, therefore, is the one who so arranges his life as to devote time both to his material needs and also to the service of the Cause. (From a letter dated 26 February 1933 written on behalf of Shoghi Effendi to an individual believer; The Compilation of Compilations, vol. II, Living the Life)
