“The law is too tenacious of private peace, to suffer litigations to be negotiable.”

Address to the United Nations (26 September 2012)
Crisis in Syria

Remarks by President Obama and Mrs. Obama in Town Hall with Youth of Northern Ireland, Belfast Waterfront, Belfast, Northern Ireland (17 June 2013)
2013

1961, Address at the University of Washington
Context: No one should be under the illusion that negotiations for the sake of negotiations always advance the cause of peace. If for lack of preparation they break up in bitterness, the prospects of peace have been endangered. If they are made a forum for propaganda or a cover for aggression, the processes of peace have been abused. But it is a test of our national maturity to accept the fact that negotiations are not a contest spelling victory or defeat. They may succeed — they may fail. They are likely to be successful only if both sides reach an agreement which both regard as preferable to the status quo — an agreement in which each side can consider its own situation to be improved. And this is most difficult to obtain. But, while we shall negotiate freely, we shall not negotiate freedom. Our answer to the classic question of Patrick Henry is still no-life is not so dear, and peace is not so precious, "as to be purchased at the price of chains and slavery." And that is our answer even though, for the first time since the ancient battles between Greek city-states, war entails the threat of total annihilation, of everything we know, of society itself. For to save mankind's future freedom, we must face up to any risk that is necessary. We will always seek peace — but we will never surrender.

Remarks of President Barack Obama To the People of Israel at Jerusalem International Convention Center in Jerusalem, Israel (21 March 2013) http://www.whitehouse.gov/the-press-office/2013/03/21/remarks-president-barack-obama-people-israel
2013

"Prose" (1885).
Observations

Peace and the Public Mind (1935)
Context: We use power, of course, in the international fields in a way which is the exact contrary to the way in which we use it within the state. In the international field, force is the instrument of the rival litigants, each attempting to impose his judgment upon the other. Within the state, force is the instrument of the community, the law, primarily used to prevent either of the litigants imposing by force his view upon the other. The normal purpose of police — to prevent the litigant taking the law into his own hands, being his own judge — is the precise contrary of the normal purpose in the past of armies and navies, which has been to enable the litigant to be his own judge of his own rights when in conflict about them with another.

Source: The Heritage Universe, Summertide (1990), Chapter 23 (p. 254)

2000s, 2002, State of the Union address (January 2002)

1961, Address at the University of Washington