PREFACE This book is meant to be a companion to 'Heretics,' and to put the positive side in addition to the negative. Many critics complained of the book called 'Heretics' because it merely criticised current philosophies without offering any alternative philosophy. This book is an attempt to answer the challenge. It is unavoidably affirmative and therefore unavoidably autobiographical. The writer has been driven back upon somewhat the same difficulty as that which beset Newman in writing his Ap