According to Ebright, three essential qualities are needed to become a scientist: a first-rate mind, curiosity, and the will to win for the right reasons. Winning for the right reasons means wanting to do the best job possible, not merely to get a prize or trophy.
Source: The Making of a Scientist, "Harvard, Achievements, and the Making of a Scientist"
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The answer quotes the key line directly: "Start with a first-rate mind, add curiosity, and mix in the will to win for the right reasons." Examiners expect all three qualities to be named and the phrase "right reasons" to be briefly explained (doing one's best, not prize-seeking). Avoid padding — state the three qualities and clarify the third one concisely.