Reincarnation in Jewish Kabbalah
“The concept of reincarnation (gilgul) became central in the psychological doctrines of the Lurianic school, perhaps for the first time in the history of the kabbalah. There are five strata in the soul, reflecting the structure of the sefirot; each of these components has its own history, and each wanders from body to body, from generation to generation, independent of the other parts. Each soul, therefore, is a meeting of parts that have their own history and experiences.”
–Joseph Dan, Kabbalah: A Very Short Introduction, pg. 82.