“It has generally been assumed that of two opposing systems of philosophy, e. g., realism and idealism, one only can be true and one must be false; and so philosophers have been hopelessly divided on the question, which is the true one.”

Referring to an aphorism of Martin Rees. (see Misattributed below)
Source: The Demon-Haunted World : Science as a Candle in the Dark (1995), Ch. 12 : The Fine Art of Baloney Detection, p. 221

Beyond Good and Evil, translated by Marianne Cowan [Henry Regnery Company, 1955, p. 139]; Jenseits von Gut und Böse [Philipp Reclam, Stuttgart, 1988, p. 130]

An Inquiry into Meaning and Truth (1940), Introduction, p. 15
1940s
Context: Science seems to be at war with itself.... Naive realism leads to physics, and physics, if true, shows naive realism to be false. Therefore naive realism, if true, is false; therefore it is false.

1860s, First State of the Union address (1861)
Context: It has been said that one bad general is better than two good ones, and the saying is true if taken to mean no more than that an army is better directed by a single mind, though inferior, than by two superior ones at variance and cross-purposes with each other. And the same is true in all joint operations wherein those engaged can have none but a common end in view and can differ only as to the choice of means. In a storm at sea no one on board can wish the ship to sink, and yet not unfrequently all go down together because too many will direct and no single mind can be allowed to control.

33
XAIPE (1950)

§ 2
Reflections on the Formation and Distribution of Wealth (1766)
Context: The earth has been cultivated before it has been divided; the cultivation itself having been the only motive for a division, and for that law which secures to every one his property. For the first persons who have employed themselves in cultivation, have probably worked as much land as their strength would permit, and, consequently, more than was necessary for their own nourishment.

Preface, § 2
The Phenomenology of Spirit (1807)

2009, First Inaugural Address (January 2009)
Context: Forty-four Americans have now taken the presidential oath. The words have been spoken during rising tides of prosperity and the still waters of peace. Yet, every so often the oath is taken amidst gathering clouds and raging storms. At these moments, America has carried on not simply because of the skill or vision of those in high office, but because We the People have remained faithful to the ideals of our forbearers, and true to our founding documents. So it has been. So it must be with this generation of Americans.

In the Veery journal interview in 1996, in reply to the question of "What is the most rewarding aspect of philosophy?" presented by Veery editor Steven Vita, later reprinted in 1997 in the Austin American-Statesman and then quoted from in The New York Times obituary entitled “Charles Hartshorne, Theologian, Is Dead; Proponent of an Activist God Was 103.”