It must be realized that people who are mostly illiterate cannot have the benefit of reading for themselves the written word and of deriving directly from it the spiritual sustenance they need for the enrichment of their Bahá'í lives. They become dependent, therefore, to a large extent on their contacts with visiting teachers. The spiritual calibre or moral quality of these teachers assumes, therefore, great importance. The National Spiritual Assembly or the Teaching Committees responsible for the selection of these teachers should bear in mind that their choice must depend, not only on the knowledge or grasp of the teachings on the part of the teachers, but primarily upon their pure spirit and their true love for the Cause, and their capacity to convey that spirit and love to others. ...What wonderful results will soon be witnessed in the areas under your jurisdiction if you devise ways and means to ensure, as far as circumstances permit, that the travelling teachers you are encouraging to circulate among the friends will all be of the standard called for in these quotations -- pure and sanctified souls, with nothing but true devotion and self-sacrifice motivating them in their services to God's Holy Cause....
- The Universal House of Justice (From a letter dated 26 October 1967 written by the Universal House of Justice to National Spiritual Assemblies engaged in mass teaching; The Compilation of Compilations, vol. II, Teaching the Masses)