Introduction; Part I. The Original Language of Thomas: 1. The problem of the original language of Thomas; 2. Methodological problems with Semitic theories; 3. Arguments against Semitisms; 4. Positive evidence for a Greek-language origin; Part II. The Synoptic Gospels and Thomas: 5. Arguments against independence; 6. Thomas and the Synoptics: a method for assessing influence; 7. Matthew in the Gospel of Thomas; 8. Luke in the Gospel of Thomas; 9. The influence of Matthew and Luke: summary and evaluation; Part III. Thomas and Other Early Christian Literature: 10. Paul in the Gospel of Thomas; 11. Hebrews in the Gospel of Thomas; 12. The 'two ways' source and the Gospel of Thomas; Conclusion.