Philosophy of Existence by Karl Jaspers.

Karl Jaspers saw being as polarity: It is the all-embracing out of which all comes to exist, but it is also the vast consciousness within. Where being appears, is world; where being is immanent, is consciousness. Jaspers’s thinking about being is like meditation about a web that embraces, sustains, and brings forth all, including oneself. All-embracing totality melts away when one approaches it as an object of research. For example, a living human being’s true nature disappears when one attempts to understand human beings in terms of anthropology. To understand humanness, one must be human—just as it is necessary to experience art in order to know art.