The book by Professor of the Moscow Theological Academy Alexei Ilyich Osipov briefly but succinctly gives an idea of one of the most difficult sections of theology - Apologetics - the defense of Christian dogma.An overview of various systems of thought, hypotheses of the existence of God, God's relationship to man and man to the Creator will help the reader to navigate the diversity of ideas of scientists, philosophers and theologians about the universe, morality, the fate of man and the world. The evidence of Truth in the personal rational and mystical experience of everyone who decides to verify the statements of representatives of the natural and human sciences, history, art, culture in general, is supported by the words of the teachers of the Church and the Russian Orthodox tradition, which will warn the reader against dangerous wandering along the paths of theosophy, occultism, false sensuality and mysticism.