Regarding your questions: the Devotional part of the
Nineteen Day Feast means the reading of prayers by Bahá'u'lláh and the Master.
If, after this, there is a period of reading of the teachings, his [the
Guardian's] writings may be included, but this does not form part of the
devotional aspect of the meeting.
- Shoghi Effendi (From
a letter written on behalf of Shoghi Effendi, 15 December 1947 to an individual
believer) The Compilation of Compilations, vol. I, Nineteen Day Feast)