At the other extreme is a set of parts that are completely unrelated: that is, a change in each part depends only on that part alone. The variation in the set is the physical sum of the variations of the parts. Such behavior is called independent or physical summativity.
Source: Definition of System, 1956, p. 23
“The battles waged by our troops are part of a broader struggle between two dramatically different systems. Under one, a small band of fanatics demands total obedience to an oppressive ideology, condemns women to subservience, and marks unbelievers for murder. The other system is based on the conviction that freedom is the universal gift of Almighty God and that liberty and justice light the path to peace. This is the belief that gave birth to our nation. And in the long run, advancing this belief is the only practical way to protect our citizens.”
2000s, 2009, Farewell speech to the nation (January 2009)
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George W. Bush 675
43rd President of the United States 1946Related quotes

2000s, 2009, Farewell speech to the nation (January 2009)
Context: As we address these challenges – and others we cannot foresee tonight – America must maintain our moral clarity. I have often spoken to you about good and evil. This has made some uncomfortable. But good and evil are present in this world, and between the two there can be no compromise. Murdering the innocent to advance an ideology is wrong every time, everywhere. Freeing people from oppression and despair is eternally right. This nation must continue to speak out for justice and truth. We must always be willing to act in their defense and to advance the cause of peace.

Speech in Perth, Scotland (13 May 1983), quoted in New York Times (14 May 1983) "British Vote Campaign Gets Off to Angry Start"
First term as Prime Minister

2000s, 2003, Hope and Conscience Will Not Be Silenced (July 2003)
Context: In the struggle of the centuries, America learned that freedom is not the possession of one race. We know with equal certainty that freedom is not the possession of one nation. This belief in the natural rights of man, this conviction that justice should reach wherever the sun passes, leads America into the world. With the power and resources given to us, the United States seeks to bring peace where there is conflict, hope where there's suffering, and liberty where there's tyranny. And these commitments bring me and other distinguished leaders of my government across the Atlantic to Africa.

Source: Women's Liberation and the African Freedom Struggle

2000s, 2004, Speech to United Nations General Assembly (September 2004)
Donald Davidson. "On the Very Idea," p. 184; as cited in: Johannes Brandl, Wolfgang Leopold Gombocz. The Mind of Donald Davidson. Rodopi, 1989, p. 152