The Sun and the Moon the Witch and the Saint

A novel which uses eastern mystical symbolism extensively. Although impressed with eastern mysticism the book isn't dogmatic about anything.

A search for meaning of life and immortality by a sorrowful heart finally reaches to realization. In the journey he encounters strange culture, foreign to himself, in a south eastern country of Asia. However, he finally discovers some truth through extensive learning, research and finally with help from a local and uneducated woman who enables him to see and accept that seed of divinity lies in mundane human experiences themselves and also heal himself from the past trauma to an extent.
His grandson overreaching the mundane explores further ways and possibilities of human existence and gains supra-normal experiences and abilities.
In the way he discovers various ancient concept and their meanings. He also finds out some popular but surprisingly not so useful concepts in the direction of spirituality.
As an ardent nature lover and spiritual seeker he explores Himalaya and other natural locations. He also happens to meet with spirit unprepared but still was blessed. His innocence and diligence helped him to eventually achieve what he aimed for.
Deciding to help humanity in fighting against its problems he sacrifices those abilities and plans to fight a long fight, that might be detrimental to him but perhaps would helpful to elevate humanity.