“A reference framework is required in order to locate events in time and space. With some contractions and omissions, Figure 1.1 shows the conventional divisions for the classical and medieval periods. Even before the birth of the idea of nationality, it is quite acceptable to refer to specific countries, such as Greece and Italy, whose boundaries are well defined. It is also usual to refer to areas in which there is felt to have been some degree of cultural unity —— for example, the Roman Empire and Islam. Sometimes space and time are embraced by one image: the Roman Empire can mean either the first four centuries of our era or the area under Roman dominion. Used with care, these concepts have value for some historical purposes, but they can be very misleading. In the first place, we have to bear in mind the shifting of frontiers; in AD 750, for example, the Iberian peninsula was predominantly Muslim while Asia Minor was Christian — by 1450 the reverse was the case. Also, and this can be more serious, the conventional divisions are associated most closely with political and military realities, and often have little bearing on intellectual or social activities.”

Source: Monetary Equilibrium (1939), p. 34
Context: An important distinction exists between prospective and retrospective methods of calculating economic quantities such as incomes, savings, and investments; and... a corresponding distinction of great theoretical importance must be drawn between two alternative methods of defining these quantities. Quantities defined in terms of measurements made at the end of the period in question are referred to as ex post; quantities defined in terms of action planned at the beginning of the period in question are referred to as.

Source: The Social Construction of Reality, 1966, p. 104 (1991, 120)

"Representación," San Carlos, 12 November 1800, Santa Bárbara Arch., 2:199-211.

Source: Classification and indexing in the social sciences (1963), p. 6 ; As cited in: Mei Hong (2006) " Potential Usage of Faceted Classification in Internet ‘‘Information Retrieval’’ http://ir.library.tohoku.ac.jp/re/bitstream/10097/17406/1/12_43.pdf" Interdisciplinary Information Sciences, Vol. 12, No. 1, p. 51

Prolegomenon
New Testament History : A Narrative Account (2001)

Teaching as a Subversive Activity (1969)
Context: A third kind of semantic awareness is an extension of the consciousness of abstracting, namely an awareness of varying levels of abstraction. Words vary in the degree to which they correspond to verifiable referents. Some words are relatively more abstract or general, and some words are relatively more concrete or specific. Related to this fact is a fourth kind of semantic awareness, which might be called the "direction of meaning." That is, with increasingly abstract or general words, (i. e., those farther removed from operationally verifiable referents), the direction of meaning shifts accordingly from "outside" to "inside." With increasingly concrete or specific words (i. e., those whose referents can be more easily verified operationally), the direction of meaning shifts accordingly from "inside" to "outside." The conventional semantic terminology for these directions of meaning are intensional (internal or inside) and extensional (external or outside). Closely bound to these directions of meaning are, of course, different kinds of meaning. The primary semantic distinction made in kinds of meaning is between connotation (intensional, subjective, personal meaning) and denotation (extensional, objective, social meaning).

The Law of Mind (1892)

The Rigveda: A Historical Analysis (2000), Chapter 4 : The Geography of the Rigveda

"Six-Part Ricercar"
Gödel, Escher, Bach: an Eternal Golden Braid (1979)