This treatise presents and combines theories and philosophies on the spiritual re-birthing and ascension process issued from psychology, comparative mythology, Jewish science, Hinduism and mystical theology, addressing the various states of the soul encountered on the way to divine union and the various ways God assists human beings in completing this process, on the personal as well as on the collective level. The analysis of the soul regeneration process ─ known as the science of the saints ─ treats about the process of human sanctification during earthly existence and eventually beyond if the worldly lifetime does not suffice to complete this process. Furthermore, the role of the Divine Feminine in salvation history is highlighted as well as the importance of the alchemical communion between divine counterparts in the inauguration of the Millennium of Peace leading towards the New Jerusalem.