The river of Pearls contain original texts from HH Shri Mataji Nirmala Devi Shrivastava, the spiritual Master, Mother and Teacher, who revealed the knowledge and praxis  of Sahaja Yoga. Mantras are some simple prescriptions, useful for daily life. Manuscript fragments are guidance She provided for a disciple writing a book. The Katmandu letters are enlightening extracts of information and advice She shared in private correspondence.