This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...g “happiness” as some undefined, irreducible primary and then attempting to live by its guid- ance. If you achieve that which is the good by a rational standard of value, it will necessarily
make you happy; but that which makes you happy, by some undefined emotional standard, is not necessarily the good. To take “whatever makes one happy” as a guide to action means: to be guide
d by nothing but one’s emotional whims. Emotions are not tools of cognition; to be guided by whims — by desires whose source, nature and meaning one does not know — is to turn oneself into...
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