In Thick and Dazzling Darkness, Peter O'Leary offers a new reading of modern and contemporary poets' treatment of religion and the nature of the divine in a secular age. The book seeks to come to terms with an often obscured spiritual impulse that drives the production and imagination of American poetry. O'Leary presents close and comprehensive readings of the modernist, late-modernist, and postmodern poets Robinson Jeffers, Frank Samperi, and Robert Duncan, as well as the contemporary poets Joseph Donahue, Geoffrey Hill, Fanny Howe, Nathaniel Mackey, Pam Rehm, and Lissa Wolsak. He argues that an anxiety of misunderstanding exists in the study and writing of poetry between secular and religious impulses and that the religious nature of poets' works is too often marginalized. Examining the works of a specific poet in each chapter, O'Leary reveals their complexity and offers a defense of the value and meaning of religious poetry against the grain of a secular society.