This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...ting the functions of a plant’s body are sufficient for its survival, but are not sufficient for an animal’s — so the automatic values provided by the sensory-perceptual mechanism of its c
onsciousness are sufficient to guide an animal, but are not sufficient for man. Man’s actions and survival require the guidance of conceptual values derived from conceptual knowledge. But conc
eptual knowledge cannot be acquired automatically.
read full book
A “ concept ” is a mental integration of two or more perceptual concretes, which are isolated by a process of abstraction and...