I wrote a book for self realization ( eternity) in the line of enlightenment, as part of serious effort to establish a doctrine called "Adi Advaita," with the tradition of Lord Venkateswara. It includes valuable knowledge of guru/self/Brahman of creation, of incarnation, of Vedas, of divine chant/mantra, of holy seven hills, of revelations (the agama science) of sadguru and yoga and related in easily understandable and modern terminology. This is useful for all; gives you in-depth key knowledge of eternity and aids in living in peace.