"The more one studies the encyclicals of Leo XIII the more one is impressed with their grasp not only of moral principles but of social realities. He was not deceived by the apparent prosperity of the capitalist order. He saw where Europe was going. Beneath the self-satisfied optimism of nineteenth century Liberal democracy he saw the growing menace of Communism and Social Revolution. At the very beginning of his pontificate in his encyclicals 'On the Evils Affecting Modern Society' and 'On Modern Errors' he warned Europe of its danger and pointed out the connection between Socialism and that wider movement of spiritual revolution which aimed at the destruction of Christianity and the complete secularization of Western culture."