By connecting the awarding of a peace prize with the concerns of a world in which terrorism has become a constant threat, Obama makes clear the exigency of his message when he says: "I do not bring with me today a definitive solution to the problems of war."
Nobel laureates are given few formal constraints in terms of their responses but Obama faced the more general constraints of trying to meet very high expectations and the conflicting expectations of the peoples of different nations. I believe that he did a good -- though not perfect -- job in meeting these differing expectations, and so crafted a speech that served as a fitting response to the occasion.
Whether or not one believes that Obama achieved the Aristotelian concept of ethos -- the ability to make a credible ethical appeal -- depends probably more on one's own politics than the speech itself....
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