  Śāntarakṣita’s magnum opus is a composition entitled Tattva-saṃgraha (Summary of reality), which contains 3645 verses. The work was provided with a prose commentary by Kamalaśīla called Tattva-saṃgraha-pañjikā. A modern edition of the verse work and its commentary together runs to more than 1100 pages. Aside from its contribution to the development of Madhyamaka thought, the work is also a valuable source of information about the state of Indian philosophy in the eighth century. The work is divided into twenty-six chapters, the topics of which are as follows: