In later theosophical works some of the doctrines originally stated in "Isis Unveiled" appeared in a significantly altered form, drawing out confusion among readers and even causing some to perceive contradiction. Specifically, the few and—according to many—ambiguous statements on reincarnation as well as the threefold conception of man as body, soul and spirit of "Isis Unveiled" stand in contrast to the elaborate and definite conception of reincarnation as well as the sevenfold conception of man in "The Secret Doctrine" (1888). Blavatsky later asserted the correctness of her statements on reincarnation and the constitution of man in "Isis Unveiled", attributing the resulting confusion and alleged contradictions to the more superficial or simplified conceptions of the ideas in "Isis Unveiled" compared to those of later works.