This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...n’s life” means the single, specific, irreplaceable lives of individual men.

The discovery of new knowledge is a value to men only when and if they are free to use and enjoy th
e benefits of the previously known. New discoveries are a potential value to all men, but not at the price of sacrificing all of their actual values. A “progress” extended into infinity, whi ch brings no benefit to anyone, is a monstrous absurdity. And so is the “conquest of space” by some men, when and if it is accomplished by expropriating the labor of other men who are left w...
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