This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
..., static quantity, waiting to be divided. He knows that all benefits have to be produced, that the gain of one man does not represent the loss of another, that a man’s achievement is not earne d at the expense of those who have not achieved it.

Therefore, he never imagines that he has any sort of unearned, unilateral claim on any human being — and he never leaves his i
nterests at the mercy of any one person or single, specific concrete. He may need clients, but not any one particular customer — he may need a job, but not any one particular job.

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