An idea is always a generalization, and generalization is a property of thinking. To generalize means to think

The word generalization in literature usually means covering too much territory too thinly to be persuasive, let alone convincing. In science, however, a generalization means a principle that has been found to hold true in every special case. ... The principle of leverage is a scientific generalization.

Generalization is a natural human mental process, and many generalizations are true — in average. What often does promote evil behavior is the lazy, nasty habit of believing that generalizations have anything at all to do with individuals.

We generalize from one situation to another not because we cannot tell the difference between the two situations but because we judge that they are likely to belong to a set of situations having the same consequence.

When a theory is sufficiently general to cover many fields of application, it acquires some "truth" from each of them. Thus... a positive value for generalization in mathematics.

To Generalize is to be an Idiot. To Particularize is the Alone Distinction of Merit — General Knowledges are those Knowledges that Idiots possess.

To generalize is to be an idiot.

Beware when the great God lets loose a thinker on this planet. Then all things are at risk. It is as when a conflagration has broken out in a great city, and no man knows what is safe, or where it will end. There is not a piece of science, but its flank may be turned to-morrow; there is not any literary reputation, not the so-called eternal names of fame, that may not be revised and condemned. The very hopes of man, the thoughts of his heart, the religion of nations, the manner and morals of mankind, are all at the mercy of a new generalization. Generalization is always a new influx of the divinity into the mind. Hence the thrill that attends it.

It is senseless to proclaim that it’s evil to make generalizations about groups. Generalization is a natural human mental process, and many generalizations are true—in average. What often does promote evil behavior is the lazy, nasty habit of believing that generalizations have anything at all to do with individuals. We have no right to pre-judge that a specific man can’t nurture, or a particular woman cannot fight.

Philosophy may have gained by the attempts in recent years to look through the fiction to the fact and to generalize corporations, partnerships, and other groups into a single conception. But to generalize is to omit, and, in this instance, to omit one characteristic of the complete corporation, as called into being under modern statutes, that is most important in business and law.

Jede Vorstellung ist eine Verallgemeinerung, und diese gehört dem Denken an. Etwas allgemein machen, heißt, es denken. ("Grundlinien der Philosophie des Rechts oder Naturrecht und Staatswissenschaft im Grundrisse", Berlin, 1833, p. 35)

The success of the imaginative experiment is always to be tested by the applicability of its results beyond the restricted locus from which it originated. In default of such extended application, a generalization started from physics, for example, remains merely an alternative expression of notions applicable to physics. The partially successful philosophic generalization will, if derived from physics, find applications in fields of experience beyond physics. It will enlighten observation in those remote fields, so that general principles can be discerned as in process of illustration, which in the absence of the imaginative generalization are obscured by their persistent exemplification.

This idea that there is generality in the specific is of far-reaching importance.

Stereotypes are, in fact, merely one aspect of the mind’s ability to make generalizations, without which science and mathematics, not to mention much of everyday life, would be impossible.