Of his approximately 15.000 works many are in the form of letters or tablets. He wrote books like “The Hidden Words”, “The Seven Valleys” and “The Book of Certitude”.
His books, letters, and writings cover religious doctrine, social and moral teachings, prayers and texts for moments of devotion and reflection.
He used a variety of styles in Arabic and Persian language and wrote about various subjects which include the interpretation of sacred writings of the past, the enunciation of laws and ordinances, mystical writings, writings about governance, letters to kings and rulers, writings about knowledge, philosophy, medicine, writings calling for education, good character and virtues, and works about other social topics