Cassius Jackson Keyser

“It happens, therefore, that readers of the book, or of any other book built about a central concept, fall into three mutually exclusive classes:

(I) The class of those who miss the central concept-(I have known a learned historian to miss it) -not through any fault of their own,-they are often indeed well meaning and amiable people,-but simply because they are not qualified for conceptual thinking save that of the commonest type.

(II) The class of those who seem to grasp the central concept and then straightway show by their manner of talk that they have not really grasped it but have at most got hold of some of its words. Intellectually such readers are like the familiar type of undergraduate who "flunks" his mathematical examinations but may possibly "pull through" in a second attempt and so is permitted, after further study, to try again.

(III) The class of those who firmly seize the central concept and who by meditating upon it see more and more clearly the tremendous reach of its implications. If it were not for this class, there would be no science in the world nor genuine philosophy. But the other two classes are not aware of the fact for they are merely "verbalists" In respect of such folk, the "Behaviorist" school of psychology is right for in the psychology of classes (I) and (II) there is no need for a chapter on "Thought Processes"- it is sufficient to have one on "The Language Habit.”
― Cassius Jackson Keyser