“To meet these challenges requires cooperation on a scale not seen before. A realistic reading of the world today demands reinvigorated international and regional institutions. It demands that we confront threats before they spiral out of the control. And it requires American leadership — to protect our interests and uphold our values.”

Letter to Indian Prime Minister Manmohan Singh, 20 October 2005 (excerpts)

Interviewed, together with his wife, at Georgetown University gotnews http://gotnews.com/ebola-czar-called-overpopulation-top-leadership-issue/ (2008)

Majlisi, Bihārul Anwār, vol.29, p. 233.

What I Didn't Find in Africa (2003)
Context: I was convinced before the war that the threat of weapons of mass destruction in the hands of Saddam Hussein required a vigorous and sustained international response to disarm him. Iraq possessed and had used chemical weapons; it had an active biological weapons program and quite possibly a nuclear research program — all of which were in violation of United Nations resolutions. Having encountered Mr. Hussein and his thugs in the run-up to the Persian Gulf war of 1991, I was only too aware of the dangers he posed.
But were these dangers the same ones the administration told us about? We have to find out. America's foreign policy depends on the sanctity of its information. For this reason, questioning the selective use of intelligence to justify the war in Iraq is neither idle sniping nor "revisionist history," as Mr. Bush has suggested. The act of war is the last option of a democracy, taken when there is a grave threat to our national security. More than 200 American soldiers have lost their lives in Iraq already. We have a duty to ensure that their sacrifice came for the right reasons.

March 21, 2006 speech http://www.memritv.org/clip_transcript/en/1081.htm
2006

1880s, Personal Memoirs of General U. S. Grant (1885)
Context: Slavery was an institution that required unusual guarantees for its security wherever it existed; and in a country like ours where the larger portion of it was free territory inhabited by an intelligent and well-to-do population, the people would naturally have but little sympathy with demands upon them for its protection. Hence the people of the South were dependent upon keeping control of the general government to secure the perpetuation of their favorite institution. They were enabled to maintain this control long after the States where slavery existed had ceased to have the controlling power, through the assistance they received from odd men here and there throughout the Northern States. They saw their power waning, and this led them to encroach upon the prerogatives and independence of the Northern States by enacting such laws as the Fugitive Slave Law. By this law every Northern man was obliged, when properly summoned, to turn out and help apprehend the runaway slave of a Southern man. Northern marshals became slave-catchers, and Northern courts had to contribute to the support and protection of the institution.

2009, First Inaugural Address (January 2009)

Introduction, p. xxv
The Age of Fallibility (2006)
Context: We must recognize that as the dominant power in the world we have a special responsibility. In addition to protecting our national interests, we must take the leadership in protecting the common interests of humanity. I go into some detail as to what that entails.
Mankind’s power over nature has increased cumulatively while its ability to govern itself has not kept pace. There is no other country that can take the place of the United States in the foreseeable future. If the United States fails to provide the right kind of leadership our civilization may destroy itself. That is the unpleasant reality that confronts us.