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.
Think always, I am ever-pure, ever-knowing, and ever-free. How I can do anything evil? Can I ever be fooled like ordinary people with the insignificant charms of lust and wealth? Strengthen the mind with such thoughts. This will surely bring real good.
-Swami Vivekananda