This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...e others. Such an assumption is a confession of their own belief that to injure, enslave, rob or murder others is in man’s self-interest — which he must selflessly renounce. The idea that ma n’s self-interest can be served only by a non-sacrificial relationship with others has never occurred to those humanitarian apostles of unselfishness, who proclaim their desire to achieve the brotherhood of men. And it will not occur to them, or to anyone, so long as the concept “rational” is omitted from the context of “values,” “desires,” “self-interest” and ethics....
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