This book is being published after a number of others, but in a certain sense it should have been my first. Without the material in this book there would be no L'Abri. In 1951 and 1952 I faced a spiritual crisis in my own life. I had become a Christian from agnosticism many years before. After that I had become a pastor for ten years in the United States, and then for several years my wife Edith and I had been working in Europe. During this time I felt a strong burden to stand for the historical Christian position, and for the purity of the visible Church. Gradually, however, a problem came to me-the problem of reality. This had two parts: first, it seemed to me that among many of those who held the orthodox position one saw little reality in the things that the Bible so clearly said should be the result of Christianity. Second, it gradually grew on me that my own reality was less than it had been in the early days after I had become a Christian. I realized that in honesty I had to go back and rethink my whole position.