This is a powerful lecture delivered by Swami Vivekananda in San Francisco in 1900.It is one of the best books delineating, in brief, the fundamentals of Vedanta in a lucid, authoritative and candid tone.
Nature grinds all of us. Keep count of the ounce of pleasure you get. In the long run, nature did her work through you, and when you die your body will make other plants grow. Yet we think all the time that we are getting pleasure ourselves. Thus the wheel goes round.
-Swami Vivekananda