Man is man so long as he is struggling to rise above nature, and this nature is both internal and external. Not only does it comprise the laws that govern the particles of matter outside us and in our bodies, but also the more subtle nature within, which is, in fact, the motive power governing the external. It is good and very grand to conquer external nature, but grander still to conquer our internal nature.
- Swami Vivekananda
( Delivered in London )The Complete Works of Swami Vivekananda/Volume 2/Jnana-Yoga/The Necessity of Religion