This compilation of lectures on Vedanta by Swami Sarvagatananda helps the reader envisage the perfect relationship between the most ancient Vedantic truths and the later developed religious thoughts and bases them on the same principle of oneness, which naturally harmonizes different religions and transcends belief systems.
I am the thread that runs through all these pearls, and each pearl is a religion or even a sect thereof. Such are the different pearls, and God is the thread that runs through all of them; most people, however, are entirely unconscious of it.
-Swami Vivekananda