"Conversations for Freethinkers" by Gotthold Ephraim Lessing is a philosophical treatise written in the form of a dialogue. The author examines numerous ethical and social issues that are important for a person striving for the development of morality and spirituality. The book opens readers to deep reflections on the relationship to truth, freedom, brotherhood and other values that are the basis of a free-thinking brotherhood. This work is considered one of the important texts of Enlightenment philosophy and has a significant influence on the development of the worldview of many members of Masonic lodges.