The author's only purely philosophical work - an examination of the possibility that the morality of an individual was the result of the demands of the survival of a social being and not, as widely held at the time the outcome of rational calculation or an inexplicable intuition. The agnostic, he held, must place morality on a scientific basis, and this means that there must be nothing in his ethics that is outside the competence of scientific enquiry. Brought up on John Stuart Mill and profoundly influenced by Darwin, Stephen attempted to cut through what he impatiently dismissed as academic debates about morality by showing that moral beliefs were the result neither of excessively rational utilitarian calculation nor of mysterious intuition but of the demands of the social organism in its struggle for survival. Leslie Stephen was the first serious critic of the novel, and he was also editor of the great Dictionary of National Biography from its beginning in 1882 until 1891. In 1859 he was ordained a minister. As a tutor at Cambridge his philosophical readings led him to skepticism, and later he relinquished his holy orders. He wrote several essays defending his agnostic position. Throughout his life Stephen was a prominent athlete and mountaineer. Virginia Woolf was the younger of his two daughters by his second wife. His first wife was Harriet Marian Thackeray, daughter of the novelist.