If I teach you, therefore, that your nature is evil, that you should go home and sit in sackcloth and ashes and weep your lives out because you took certain false steps, it will not help you, but will weaken you all the more, and I shall be showing you the road to more evil than good. If this room is full of darkness for thousands of years and you come in and begin to weep and wail, "Oh the darkness", will the darkness vanish? Strike a match and light comes in a moment. What good will it do you to think all your lives, "Oh, I have done evil, I have made many mistakes"? It requires no ghost to tell us that. Bring in the light and the evil goes in a moment. Build up your character, and manifest your real nature, the Effulgent, the Resplendent, the Ever-Pure, and call It up in everyone that you see.
- Swami Vivekananda
The Complete Works of Swami Vivekananda/Volume 2/Practical Vedanta and other lectures/Practical Vedanta: Part IV