In the not-too-distant past, man enjoyed a profound sense of identity, permanence and continuity; the poignancy of change had little effect on his life. Modern man, on the other hand, keenly experiences change and impermanence in his world. He is impaled on both horns of a dilemma. Conditioned by dualistic thought patterns, 20th-century man still thinks in terms of polarities: good and bad, love and hate. Because of this mental framework, he has difficulty holding polarities in creative tension. Harris suggests ways by which man can become oriented to deal with paradox and live with creative tension. And he sees this new world vision as a source of hope.