 Bahá 'u'lláh wrote many written works taken as scripture in the religion of which only a fraction have been translated into English . There have been 15 @,@ 000 works both small and large noted – the most significant of which are the Most Holy Book , the Book of Certitude , the Hidden Words , and the Seven Valleys . There is also a series of compilation volumes of smaller works the most significant of which is the Gleanings from the Writings of Bahá 'u'lláh . 
