Before the beginning of World War II, during the time of the Modernist movement in philosophy, George Santayana wrote these five descriptive essays. He examined John Locke’s sensationalism, British Idealism, the “Theory of Relativity”, Freud’s psychology, and Julien Benda’s preachment on the relations between God and the world. [Summary written by Gary Gilberd]

Even before the Great War turned the world upside down, Western civilization was being revolutionized at all levels: intellectually, philosophically, artistically. Noted positivist philosopher George Santayana published this volume on the eve of the War, trying to portray the status of philosophy and theology at that moment by analyzing six significant topics:
1. the intellectual "temper" of the age
2. the clash between Modernism and Christianity
3. the new idealism of Henri Bergson
4. the new skepticism of Bertrand Russell
5. Shelley's fusion of philosophy and poetry
6. the so-called "genteel" tradition in American philosophy.

The Life of Reason, subtitled "the Phases of Human Progress", is a book published in five volumes from 1905 to 1906, by Spanish-born American philosopher George Santayana (1863-1952). It consists of Reason in Common Sense, Reason in Society, Reason in Religion, Reason in Art, and Reason in Science. The work is considered to be the most complete expression of Santayana's moral philosophy [...]. Santayana's philosophy is strongly influenced by the materialism of Democritus and the refined ethics of Aristotle, with a special emphasis on the natural development of ideal ends. The Life of Reason is sometimes considered to be one of the most poetic and well-written works of philosophy in Wester...