枢軸時代
Jaspers introduced the concept of an Axial Age in his book ("The Origin and Goal of History"), published in 1949. The simultaneous appearance of thinkers and philosophers in different areas of the world had been remarked by numerous authors since the 18th century, notably by the French Indologist Abraham Hyacinthe Anquetil-Duperron. Jaspers explicitly cited some of these authors, including Victor von Strauß (1859) and Peter Ernst von Lasaulx (1870). He was unaware of the first fully nuanced theory from 1873 by John Stuart Stuart-Glennie, forgotten by Jaspers' time, and which Stuart-Glennie termed “the moral revolution”. Stuart-Glennie and Jaspers both claimed that the Axial Age should be viewed as an objective empirical fact of history, independently of religious considerations. Jaspers argued that during the Axial Age, "the spiritual foundations of humanity were laid simultaneously and independently in China, India, Persia, Judea, and Greece. And these are the foundations upon which humanity still subsists today".