The project of providing a rational vindication of morality had decisively failed; and from henceforward the morality of our predecessor culture—and subsequently of our own—lacked any public, shared rationale or justification. In a world of secular rationality religion could no longer provide such a shared background and foundation for moral discourse and action; and the failure of philosophy to provide what religion could no longer furnish was an important cause of philosophy losing its central cultural role and becoming a marginal, narrowly academic subject.
