An extremely important Jewish writer and thinker of the first century AD, Philo of Alexandria exercised through his ideas and language a lasting influence on the development and growth of Christianity in the New Testament period and later. This book provides an introduction to the major themes and ideas in the religious and philosophical thinking of Philo and outlines the importance of his thought by means of introductory treatments and sections of freshly translated text and commentary. Dr Williamson illustrates in his work the place and significance of Philo within Judaism and as part of the background to Christianity, and so provides a valuable resource for scholars and students in this area of study.