It is the same strain which runs, although in a somewhat lower key, through his two larger "mathnavis", the Rawshana-i-nama () (or Book of Enlightenment, also known as "Shish Fasl"), and the "Sa'datnama" (Book of Felicity). The former is divided into two sections: the first, of a metaphysical character, contains a sort of practical cosmography, chiefly based on Avicenna's theories, but frequently intermixed both with the freer speculations of the well-known philosophical brotherhood of Basra, the Ikhwan al-Safa, and purely Shi'ite or Isma'ili ideas; the second, or ethical section of the poem, abounds in moral maxims and ingenious thoughts on man's good and bad qualities, on the necessity of shunning the company of fools and double-faced friends, on the deceptive allurements of the world and the secret snares of ambitious men craving for rank and wealth. It concludes with an imaginary vision of a beautiful work of spirits who have stripped off the fetters of earthly cares and sorrows and revel in the pure light of divine wisdom and love.