Swami Vivekananda 
Karma Yoga [EPUB ebook] 

This is a set of lectures by Swami Vivekananda on the subject of Karma Yoga, one of the several yogic paths to enlightenment. Karma Yoga is a mental discipline which allows one to carry out one's duties as a service to the entire world, as a path to enlightenment. By working in the real world, but giving up attachment to work, we can obtain spiritual liberation. Vivekananda discusses the concept of Karma in the Bhagavada-Gita, and singles out the Buddha as a primary example of this form of yoga.