Brahma Sutras systematizes the philosophy of the Upanishads in 555 aphorisms. In this book the original aphorisms are given in Devanagari followed by word-for-word English rendering, and the interpretation of the sutra according to Shankaracharya. The introduction contains a comparative study of the bhashyas of Shankara, Ramanuja, and Nimbarka.
That which is nearest is least observed. The Atman is the nearest of the near, therefore a careless and unsteady mind gets no clue to the Atman. But one who is alert, calm, self-restrained, and discriminating, ignores the external world and, diving more and more into the inner world, realizes the glory of the Atman and becomes great.
-Swami Vivekananda