The "ego" like its correlative "non-ego", is the product of the body, mind etc. The only proof of the existence of the real Self is realisation.
Swami VivekanandaThere is no limit to the power of the human mind. The more concentrated it is, the more power is brought to bear on one point
Swami VivekanandaHow has all the knowledge in the world been gained but by the concentration of the powers of the mind? The world is ready to give up its secrets if we only know how to knock, how to give it the necessary blow. The strength and force of the blow come through concentration. There is no limit to the power of the human mind. The more concentrated it is, the more power is brought to bear on one point; that is the secret.
Swami VivekanandaEven the lowest of the Hindus, the Pariah, has less of the brute in him than a Briton in a similar social status. This is the result of an old and excellent religious civilization. This evolution to a higher spiritual state is possible only through discipline and education.
Swami VivekanandaImpurity is a mere superimposition under which your real nature has become hidden. But the real you is already perfect, already strong.
Swami VivekanandaThe first angle is, love questions not. It is not a beggar. ... When love asks nothing, [when it] gives everything. This is the real spiritual worship, the worship through love. Whether God is merciful is no longer questioned. He is God; He is my love. Whether God is omnipotent and almighty, limited or unlimited , is no longer questioned.
Swami Vivekananda