This 1955 essay by Kelsen on democracy was also important for summarizing his critical stance towards the 1954 book on politics by his former student in Europe Eric Voegelin. Following this, in Kelsen's book entitled "A New Science of Politics" (Ontos Verlag, reprinted in 2005, 140pp, originally published 1956), Kelsen enumerated a point by point criticism of the excessive idealism and ideology which he saw as prevailing in Voegelin's book on politics. This exchange and debate has been documented in the appendix to the book, written by the author on Voegelin, Barry Cooper, entitled "Voegelin and the Foundations of Modern Political Science" from 1999. Kelsen's other book defending his realist position regarding the issue of the separation of state and religion as opposed to that of Voegelin's position on this issue was published posthumously under the title "Secular Religion." Kelsen's objective in part was to safeguard the importance of the responsible separation of state and religion for those sympathetic to religion and concerned with this separation. Kelsen's 1956 book was followed in 1957 by a collection of essays on justice, law and politics, most of them previously published in English. It had originally been published in the German language in 1953.