This book is based substantially on a Ph.D. thesis which was accepted by Durham University in 1969. Some sections remain unaltered, while others have been considerably abbreviated. The footnotes have been trimmed as much as possible, which has involved referring to only a selection of the rapidly increasing flood of secondary literature.

The aim of the book is to use the results from a detailed study of Luke's treatment of the Gentile theme to assess modern approaches to the interrelated problems of the theology and historical reliability of Luke–Acts. While I have often disagreed with them, I should like to record my debt to Professors H. Conzelmann and E. Haenchen, whom I have never met in person, but whose writings have been a constant source of stimulation.

It is with the greatest pleasure that I take this opportunity to express my gratitude to Professor C. K. Barrett of Durham University, who has watched over this work at every stage. He has been an unfailing source of information, patient advice, intellectual stimulation and warm friendship. I should also like to thank the Rev. D. P. Davies of St David's College, Lampeter, and Professor R. McL. Wilson of St Andrews University, both of whom made valuable suggestions for improvement which have been incorporated into the final version. Finally, my thanks are due to my wife, whose support and encouragement have been essential for the production of this work.