1895. Arthur James Balfour succeeded his uncle, Lord Salisbury, who had been his political mentor and champion. However, his initial interests were not political. He enjoyed music and poetry, and was first known as a renowned philosopher, publishing A Defense of Philosophic Doubt, The Foundations of Belief, and Theism and Humanism. Contents Part I. Some Consequences of Belief: Naturalism and Ethics; Naturalism and Aesthetic; Naturalism and Reason. Contents Part II. Some Reasons for Belief: The Philosophic Basis of Naturalism; Idealism, After Some Recent English Writings; Philosophy and Rationalism; and Rationalist Orthodoxy. Contents Part III. Some Causes of Belief: Causes of Experience; and Authority and Reason. Contents Part IV. Suggestions Towards a Provisional Philosophy: The Groundwork; Beliefs and Formulas; Beliefs, Formulas, and Realities; Ultimate Scientific Ideas; Science and Theology; and Suggestions Towards a Provisional Unification.