In the course of writing this book I have received help and encouragement from many people.

I am indebted first to McGill University and the Governors of United Theological College, Montreal, who granted me a sabbatical leave for the second half of session 1966–7. Dr John C. Kirby undertook the work of the New Testament department during my absence, and Dr J. Arthur Boorman acted as Principal of United Theological College.

The Faculty Fellowships Commission of the American Association of Theological Schools awarded me a stipend to enable me to study and write in Jerusalem and Rome, and this was much appreciated.

In Jerusalem I had helpful discussions with several scholars, and I wish to mention in particular Professor David Flusser of the Hebrew University. He welcomed me to his seminar and made many stimulating suggestions on the subject of the spirit and the paraclete in the Gospel of John.

During our stay in Rome, where the first draft of the book was completed, I was warmly welcomed to the Waldensian Theological Faculty by Dean Vinay and his staff. The Faculty librarians, Professor Alberto Soggin and Signora Soggin, met all my requests most graciously. Of others who made our stay in Rome enjoyable and fruitful I must mention the Reverend and Mrs Alexander MacLean of the Church of Scotland, for their hospitality was boundless.

I have also to acknowledge considerable and always ready assistance from Miss Norma Johnston and her colleagues in Divinity Hall library, McGill University. Much of the typing required has been done by Mrs R. de la Ronde and my secretary, Mrs Harold Kennedy.