It is good and very grand to conquer external nature, but grander still to conquer our internal nature.... This conquering of the inner man, understanding the secrets of the subtle workings that are within the human mind, and knowing its wonderful secrets, belong entirely to religion.
Tell the truth boldly, whether it hurts or not. Never pander to weakness. If truth is too much for intelligent people and sweeps them away, let them go; the sooner the better.
Every idea has to become broad till it covers the whole of this world, every aspiration must go on increasing till it has engulfed the whole of humanity, nay, the whole of life, within its scope.
There is, however, only one idea of duty which has been universally accepted by all mankind, of all ages and sects and countries, and that has been summed up in a Sanskrit aphorism thus: "Do not injure any being; not injuring any being is virtue, injuring any being is sin."