In all areas of scientific endeavor, the twentieth-century mind has repeatedly searched for a rule or principle by which the truth or falsehood of a statement may be judged. The first question of the scientist is: ""How do I ""know"" such and such to be the case?"" In theology, too, increasing interest has been focused on the sources of truth; the Christian theologian asks, ""Why should I accept this doctrine or that moral precept? By what authority...