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If a man, day and night, thinks he is miserable, low and nothing, nothing he becomes. If you say yea, yea, "I am, I am", so shall you be.

Swami Vivekananda (2015). “The Complete Works of Swami Vivekananda”, p.1277, Manonmani Publishers
If a man, day and night, thinks he is miserable, low and nothing, nothing he becomes. If you say yea, yea, I am, I am, so shall you be.