This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...eater one — this is not a sacrifice, but a gain.

Remember further that all of a man’s values exist in a hierarchy; he values some things more than others; and, to the extent th
at he is rational, the hierarchical order of his values is rational: that is, he values things in proportion to their importance in serving his life and well-being. That which is inimical to his life and well-being, that which is inimical to his nature and needs as a living being, he devalues.

Conversely, one of the characteristics of mental illness is a distorted value s...
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