Newman's is perhaps the most illustrious religious mind in the modern Anglo-Saxon world. Exactly half of his long life (1801–1890) was devoted to the Anglican Church, the other half to the Catholic. However clear and unequivocal his conversion, his intellectual position is nevertheless the same in both periods. The sources of his inner life stem from the revelation of the Eternal, which came to him when he was fifteen years old and never left him his whole life long. His philosophical thinking is influenced by English empiricism that involves an attitude of restraint concerning intellectual speculation. It is in conformity with the English love of the concrete, of the individual-personal element and, with due respect to the spirit of tradition, of Christian freedom. And even though Newman's theology is rooted in ancient Christian tradition, his missionary conscience is directed towards the future, towards the spiritual conflicts of the twentieth century. Their unfolding he sensed with astonishing prevision. Just as his sermons and writings are divided almost equally between the two periods of his life (with the exception of perhaps one decade at the height of his career, in which he saw himself doomed almost to inactivity because of tragic misunderstandings), so his life's work has become the common possession of all Christendom, first, in his native land and, then, increasingly in other countries. For what Newman has to say actually concerns the whole Christian world.