This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...is sense data into percepts automatically; but the process of integrating percepts into concepts — the process of abstraction and of concept-formation — is not automatic.
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rocess of concept-formation does not consist merely of grasping a few simple abstractions, such as “chair,” “table,” “hot,” “cold,” and of learning to speak. It consists of a met
hod of using one’s consciousness, best designated by the term “conceptualizing.” It is not a passive state of registering random impressions. It is an actively sustained process of identif...