“promotion of the spiritual life of local Bahá'í communities”: - “what is most imperative for”

[Y]ou instance the difficulties of local communities which are faced with the task of reorienting and integrating into the Cause new believers who enter with all sorts of immoral and even criminal tendencies from their former life. This is indeed difficult, but this is the very stuff of the work of the Cause. The Bahá'í Faith not only provides teachings in accordance with which the behavior of human beings can be reformed, but also makes available a spiritual power which reinforces the devoted efforts of every believer, whether veteran or neophyte. Arising to serve the Cause has, itself, a transforming effect upon believers, as the beloved Guardian wrote with respect to service upon Spiritual Assemblies: "If we but turn our gaze to the high qualifications of the members of Bahá'í Assemblies, as enumerated in ‘Abdu'l-Bahá's Tablets, we are filled with feelings of unworthiness and dismay, and would feel truly disheartened but for the comforting thought that if we arise to play nobly our part every deficiency in our lives will be more than compensated by the all-conquering spirit of His grace and power." Thus, what is most imperative for the promotion of the spiritual life of local Bahá'í communities is the stimulation of the believers to increase their devotion to Bahá'u'lláh, their absolute reliance upon Him and upon His love, and their determination to apply His teachings in every aspect of their lives. This stimulation can be conveyed from heart to heart and mind to mind by devoted Bahá'ís without the need of formal training. 

- The Universal House of Justice  (From a letter dated December 2, 1976 to a National Spiritual Assembly; compilation: ‘Guidelines for Local Spiritual Assemblies’, prepared by NSA of USA)