This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
... 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
a blind robot, operated by unknowable demons (by one’s stale evasions), a robot knocking its stagnant brains out against the walls of reality which it refuses to see.
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