"I shall leave this office with regret at not completing my term, but with gratitude for the privilege of serving as your President for the past 5 1/2 years. These years have been a momentous time in the history of our Nation and the world. They have been a time of achievement in which we can all be proud, achievements that represent the shared efforts of the Administration, the Congress, and the people. But the challenges ahead are equally great, and they, too, will require the support and the efforts of the Congress and the people working in cooperation with the new Administration. We have unlocked the doors that for a quarter of a century stood between the United States and the People's Republic of China. We must now ensure that the one quarter of the world's people who live in the People's Republic of China will be and remain not our enemies but our friends."