This classic work in the field was originally published by Regnery Gateway in 1983. 'This is a serious, learned, and searching exploration of some of the most difficult questions which have ever concerned the human mind. It is also toughminded in the sense that it recognizes all the difficulties, begs no questions, offers no easy solutions and, unlike conventional protests against modern scepticism, makes no plea for a leap in the dark to an unexamined faith.') Joseph Wood Krutch, from the Introduction.