For Brun, the separation of men from existence, which expresses itself in various forms of anxiety, is the central concern of philosophy. While the separation of men from one another can be partly overcome by language and by modern technology's "conquests," the ontological separation cannot, the philosophic attitude of wonder can never be entirely replaced by nihil mirari. He takes issue with the philosophies of praxis which regard human action as the potential remedy for all separation. The thesis is defended capably and passionately.--W. L. M.