A.E. Dyson defines 'the fifth dimension' as our unending moment of consciousness - related Janus-wise to clock-time (the Second Law of Thermodynamics) and to Eternity. He studies in depth plays by Aeschylus, Sophocles and Euripides; Christ's two great prayers and his proclamation of 'The Kingdom'; and mystical traditions - with Otto, T.S. Eliot, Vaughan, Blake, Wordsworth among the witnesses. He attacks all dogmatic churches, finding in help for the homeless, help for our planet, help for cultural minorities, the touchstone of religion. The reality of our eternal destiny and our earthly battle with evil is asserted, against the cultural degradation of this century. A challenge to youth especially, in the coming millennium.