The thesis deals with the American bishop, philosopher and theologian who is a famous orator and television personality, Fulton John Sheen. It deals with his philosophical opinion and his personalism and Catholic teaching in the problems of the contemporary era, that is, of the 20th century. The work has a special focus on three selected topics and social changes, which, in addition to his rich opus, he also dedicated televised lectures that are more accessible and adapted to a wider range of people. The topics and social changes mentioned in the work, which Sheen dealt with in detail, are: communism, social problems with an emphasis on poverty, secularisation and the question of God in society, and the sexual revolution. The first part of the paper refers to Sheen's biography and the justification of his status as a great philosopher of the 20th century who belongs to the circle of well-known Catholic personalists and promoters of human rights and the dignity of the person. This is especially evident in his discussion of communism, where he criticizes communism as an ideology and as a movement with consequences. He was also known for promoting the dignity of the poor in non-communist systems. The second part of the work refers to cultural changes such as secularization, where Sheen responds to such ideas with his philosophy about God. The last change that the paper deals with is the sexual revolution in the context of the materialization of the person in the postmodern age at the very end of the 20th century. The paper is processed as a comparison of the ideas and changes themselves and Sheen's response to the aforementioned.