...temporal experience is neither completely recurrent (in which case it would be wholly knowable) nor completely variable (in which case it would be wholly inscrutable). In effect, it is more like a piece of complex music, a Bach fugue heard for the first time. In one sense, we are excited and surprised by the novel disposition of tones and rhythms and by the uncanny variety of the treatment. In another sense, we realize that recurring ideas and cycles are what give the work its native character, and that the variations, however stunning, have significance only in terms of their relationship to these underlying themes. Conversely, the recurrent themes are realizable in their fullest sense only through the variations upon them. The careful student of time is thus as sure that certain things will recur as he is sure that they will recur in dazzling new forms.

Autor: Robert Grudin