Karma Yoga

Karma Yoga is a system of ethics and religion intended to attain freedom through unselfishness, and by good works. The Karma Yogis need not believe in any doctrine whatever. They may not believe even in God, may not ask what their soul is, nor think of any metaphysical speculation. They have got their own special aim of realizing unselfishness, and they have to work it out themselves.

Karma Yoga, Complete Works, 1: 111, New York 1896.