; or one of its commentaries , the upanishads , which are the basis of all the orthodox religious and philosophical systems of india ; or the buddhist canon tripitaka ; the sacred book of islam , the koran , written around 650 a.d. ; the sacred book of shintoism , nihonshoki , from 720 a.d. ; or the book of wisdom zhuangzi , the treatise of laozi daodejin , the works of confucius from the 6th to 5th centuries b.c .