A worker's success in contributing to the common good is measured by how well she or he does the job, by what the worker does.
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Positive thinking is an attitude that pushes you to expect good and desired results. Power of positivity helps you in creating and transforming energy into reality. Positive mindset helps you to seek happiness, health and a happy ending regardless of the situation. Lots of successful people have recognized the positivity as the key to success.
<u>Explanation:</u>
We can infer the meaning of this quote by considering the context of the statement. For example, a few lines before this quote, we are told by Alexis de Tocqueville,
<em>"He who has set his heart exclusively on the pursuit of worldly welfare is always in a hurry, for </em><em>he has but a limited time at his disposal to reach, to grasp, and to enjoy it."</em>
Hence, what the quote means is that man (i.e Gatsby), has an insatiable desire to enjoy what life can offer with the fear of dying in mind; despite the good things he already has.