This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
... today which wipes out all his values tomorrow.

A rational man does not indulge in wistful longings for ends divorced from means. He does not hold a desire without knowing (or lear
ning) and considering the means by which it is to be achieved. Since he knows that nature does not provide man with the automatic satisfaction of his desires, that a man’s goals or values have to be achieved by his own effort, that the lives and efforts of other men are not his property and are not there to serve his wishes — a rational man never holds a desire or pursues a goal wh...
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