The Principle of Hope (German: Das Prinzip Hoffnung) is a book by the Marxist philosopher Ernst Bloch, published in three volumes in 1954, 1955, and 1959, in which the author explores utopianism, studying the utopian impulses present in art, literature, religion and other forms of cultural expression, and envisages a future state of absolute perfection. The Principle of Hope has become fundamental to dialogue between Christians and Marxists.