This introductory chapter maps out the occasion, main arguments, and methodology of the book. Written in response to the crisis of meaning, the book traces it to the dissociation of time from being. The fact that meaningful things and events take time to unfold leads us to wonder what sense of time is involved is this “taking time.” In light of Heidegger’s thinking, an ontology of temporal differentiation is developed in contrast both to the ontology of the extant and to post-metaphysical differential ontology, in which time is discussed in conjunction with being, finitude, subjectivity, and plurality. At the end of the chapter, a synopsis of the following chapters is provided.