This book owes its origin to the fact that in the autumn of 1921 the authorities of Manchester College, Oxford invited me to deliver the inaugural course of a lectureship in religion newly established under the will of the late Professor Upton. No conditions being attached to this appointment, it seemed a suitable opportunity to discuss, so far as possible in the language of the moment, some of the implicits which I believe to underlie human effort and achievement in the domain of the spiritual life. The material gathered for this purpose has now been added to, revised, and to some extent re-written, in order to make it appropriate to the purposes of the reader rather than the hearer.
