Man's Rise to Civilization (1968)
Context: For a tribe to endure, it must find some way to achieve internal unity—and that way usually is external strife. The tribe exists at all times in a state of mobilization for war against its neighbors. The slightest incident, or often merely a desire to increase prestige, is enough to set off a skirmish, and in such circumstances hatred against external enemies must be unremitting.<!-- p. 97
“Democratic nations must seek and find unity in diversity, while Communists achieve unity through conformity.”
Address before the Indian Council of World Affairs, New Delhi, India, April 5, 1956, as quoted in Walter P Reuther: Selected Papers (1961), by Henry M. Christman, p. 133 If the peoples of great nations can work, sacrifice, fight, and die together because they share common fears and common hatreds in war, why can we not find a way to tap the great spiritual reservoir that lies deep within each of us and get people and nations working, sacrificing, and building together in peacetime because they share common hopes and common aspirations.
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Walter Reuther 25
Labor union leader 1907–1970Related quotes

We must strive for unity at any price and with all sacrifices. But while we are uniting and organizing, we must rid ourselves of all foreign and antagonistic elements. What would one say of a general who in the enemy’s country sought to fill the ranks of his army with recruits from the ranks of the enemy? Would that not be the height of foolishness? Very well, to take into our army – which is an army for the class struggle and the class war – opponents, soldiers with aims and interests entirely opposite to our own, – that would be madness, that would be suicide.
No Compromise – No Political Trading (1899)
“Reconciliation and unity cannot be achieved through a politically motivated Bill.”
Statement to the media, 23 June 2005 http://www.fijitimes.com/story.aspx?id=23578, on the government's proposal to establish a Reconciliation and Unity Commission (excerpts)

“Diversity in counsel, unity in command.”
Source: Attributed to Cyrus the Great, in Strategic Management : A New View of Policy and Planning, by Charles W. Hofer (1979), p. 163. Hofer does not cite any particular source, but this quote is frequently cited in literature written by and for American businessmen.

“Knowledge leads to unity, and Ignorance to diversity.”
Saying 368
Râmakrishna : His Life and Sayings (1898)

The Sun My Heart (1996)
Context: There is no phenomenon in the universe that does not intimately concern us, from a pebble resting at the bottom of the ocean, to the movement of a galaxy millions of light years away. Walt Whitman said, "I believe a blade of grass is no less than the journey-work of the stars...." These words are not philosophy. They come from the depths of his soul. He also said, "I am large, I contain multitudes." This might be called a meditation on "interfacing endlessly interwoven." All phenomena are interdependent. When we think of a speck of dust, a flower, or a human being, our thinking cannot break loose from the idea of unity, of one, of calculation. We see a line drawn between one and many, one and not one. But if we truly realize the interdependent nature of the dust, the flower, and the human being, we see that unity cannot exist without diversity. Unity and diversity interpenetrate each other freely. Unity is diversity, and diversity is unity. This is the principle of interbeing.

On the Correct Handling of Contradictions Among the People
Original: (zh-CN) 在一九四二年,我们曾经把解决人民内部矛盾的这种民主的方法,具体化为一个公式,叫做“团结——批评——团结”。讲详细一点,就是从团结的愿望出发,经过批评或者斗争使矛盾得到解决,从而在新的基础上达到新的团结。按照我们的经验,这是解决人民内部矛盾的一个正确的方法。

Mont Saint Michel and Chartres (1904)
Context: No one has ventured to explain why the Virgin wielded exclusive power over poor and rich, sinners and saints alike. Why were all the Protestant churches cold failures without her help? Why could not the Holy Ghost,— the spirit of Love and Grace,— equally answer their prayers? Why was the Son powerless? Why was Chartres Cathedral — like Lourdes today — the expression of what is in substance a separate religion? Why did the gentle and gracious Virgin Mother so exasperate the Pilgrim Father? Why was the Woman struck out of the Church and ignored in the State? These questions are not antiquarian or trifling in historical value; they tug at the very heart-strings of all that makes whatever order is in the cosmos. If a Unity exists, in which and towards which all energies centre, it must explain and include Duality, Diversity, Infinity,— Sex!
“The unity and diversity of organisms become apparent even at the cellular level.”
Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

Divided Belgium has a new King Philippe http://www.telegraph.co.uk/news/worldnews/europe/belgium/10193295/Divided-Belgium-has-a-new-King-Philippe.html, Telegraph (July 21, 2013)