This collection investigates the historical and psychological identity of the non-Jewish Jew, exploring how individuals of Jewish descent contributed to universalist political and intellectual movements. Isaac Deutscher, a prominent historian and biographer of the Soviet era, utilizes his own background as a secular Marxist to analyze the lives of figures like Spinoza, Marx, and Trotsky. He argues that these thinkers transcended their religious and ethnic origins to formulate theories that addressed the human condition on a global scale. The essays serve as a critical examination of the tension between particularist identity and universalist revolutionary thought.

Scholars frequently cite this work as a significant contribution to the study of 20th-century political thought and the history of the European Left. Readers often note the intellectual density of the prose, which demands a foundational understanding of Marxist theory and European history.