The book posits that time is divided into seven cycles of 7,000 years each, corresponding to the seven lower Sefirot . We are currently believed to be in the cycle of Gevurah (Judgment), which explains the presence of evil and strict law in our world.
A community-uploaded PDF titled can be found on Scribd . This version often includes additional esoteric commentaries by Moshe Ben Yaakov of Kiev. sefer hatemunah pdf best