The present volume represents the first series of lec tures, delivered during the academic year 1921 — 2. It does not claim for a moment to exhaust a subject to which the avenues of approach are so many and so varied; but the survey taken and the line of argument followed reach in the course of these ten lectures their natural conclusion. Hence it has seemed to me most appropriate to publish this series by itself, without waiting for the second, still to be delivered, in which I hope to discuss some other funda mental religious ideas. In preparing the lectures for the press I have been much indebted to my brother, Professor James Seth, to Mr. H. F. Hallett, my former Assistant, now Lecturer in the University of Leeds, and, not least, to Mr. J. B. Capper, my oldest friend. I take this opportunity of thanking them for the care they have bestowed upon the proofs and for many valuable suggestions which have often enabled me to clarify the argument and to improve its form.