This volume contains the Gifford Lectures delivered in the University of Aberdeen in the years 1912 and 1913. Contents: Hume's dialogues concerning natural religion; Kant and the idea of intrinsic value; 19th century duel between idealism and naturalism; liberating influence of biology; lower and the higher naturalism; man as organic to the world; ethical man, the religion of humanity; positivism and agnosticism; idealism and pan-psychism; idealism and mentalism; lower pantheism and the doctrine of degrees of truth; criterion of value, its nature and justification; ideal and the actual; absolute and the finite individual; idea of creation; teleology as cosmic principle; time and eternity; Bergonian time and a growing universe; pluralism, evil and suffering.