Yannaras is undoubtedly one of the most significant thinkers of our time. Kallistos Ware once described him as "the most creative and prophetic religious thinker at work in Greece today." His very wide and no less deep education helps him to develop an inimitable blend of philosophy, theology, and social criticism, and to speak in an original way about the traditional and contemporary issues of human existence, as well as the latest challenges of modern empirical science and political engagement. A detailed knowledge of the writings of the Holy Fathers has always been his foundation amidst the labyrinth of modern thought—which is intimately bound up with psychoanalysis, environmental issues, human rights, postmodernism, and pluralism, to mention just a few. Insistence on the primacy, uniqueness, and eternal value of human personality prevails in almost all his works and inspires his own vigorous theological and ecumenical engagement, based on the Orthodox eucharistic and ascetic tradition.