Lovejoy (1873-1962) was America's foremost historian of ideas, a major participant in the philosophical debates of the twentieth century, and a prominent advocate of academic freedom. The product of an emotionally unsettled childhood and an evangelical father, Lovejoy reacted against his father by postulating the certainty of self-sufficient reason. He believed that only the principles of reason could order the world and so make our universe intelligible. Originally published in 1980. A UNC Press Enduring Edition -- UNC Press Enduring Editions use the latest in digital technology to make available again books from our distinguished backlist that were previously out of print. These editions are published unaltered from the original, and are presented in affordable paperback formats, bringing readers both historical and cultural value.