Samuel Butler 
God the Known and God the Unknown (Barnes & Noble Digital Library) 

Published in 1917, this volume is based on a series of articles published by Butler in the 1870s and revised by him prior to his death.  Here Butler sets forth his conception of the divine, as a evolutionary force that encompasses all living things and tends toward ever-greater unity and self-awareness.

About the author

Samuel Butler (1835-1902) was an English novelist, essayist, and critic. He wrote on Christian orthodoxy, evolutionary thought, and Italian art.  He is best known for The Way of All Flesh (1903), a semiautobiographical novel, which, with ferocious wit and palpable anger, skewers the pernicious effects of religious hypocrisy and Erewhon (1872), a science-fictional satire of Victorian society.