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.
Seek ye first the kingdom of God, and everything else shall be added unto you. This is the one great duty, this is renunciation. Live for an ideal, and leave no place in the mind for anything else.
-Swami Vivekananda