Being and Time mentioned in "Being and Time", has been identified by some with Heidegger's central notion of "Sorge" ("cura", care or concern). However, for Heidegger, "theoretical" knowledge represents only one kind of intentional behaviour, and he asserts that it is grounded in more fundamental modes of behaviour and forms of practical engagement with the surrounding world. Whereas a theoretical understanding of things grasps them according to "presence," for example, this may conceal that our first experience of a being may be in terms of its being "ready-to-hand." Thus, for instance, when someone reaches for a tool such as a hammer, their understanding
Being and Nothingness has been traditional with non-existential philosophers" and thereby remaining a Cartesian rationalist. Susan Sontag, writing in an essay in "The Supplement" to the "Columbia Spectator" that was later published in "Against Interpretation" (1966), praised Sartre's discussions of the body and concrete relations with others, identifying them as part of a French tradition of serious thought about problems of fundamental importance. John B. Vickery wrote that Sartre's work resembles Sir James George Frazer's "The Golden Bough" (1890) in the way its author "merges psychology and the concrete sense of fiction", although he considered it less readable than Frazer's work. The philosopher