“All wars will be settled by sea power.”

"Conlath and Cuthona"
The Poems of Ossian

Source: The Blind Assassin

Canto V, lines 28–30 (tr. Charles S. Singleton).
The Divine Comedy (c. 1308–1321), Inferno

On his expectations of war, and that he would someday become the Chief of Naval Operations, in a conversation during the mid 1930s with his son, Chester W. Nimitz, Jr.; as quoted in Nimitz (1976) by E. B. Potter. ISBN 0870214926

§ 6
"Looking Back on the Spanish War" (1943)
Context: The outcome of the Spanish war was settled in London, Paris, Rome, Berlin — at any rate not in Spain. After the summer of 1937 those with eyes in their heads realized that the Government could not win the war unless there were some profound change in the international set-up, and in deciding to fight on Negrin and the others may have been partly influenced by the expectation that the world war which actually broke out in 1939 was coming in 1938. The much-publicized disunity on the Government side was not a main cause of defeat. The Government militias were hurriedly raised, ill-armed and unimaginative in their military outlook, but they would have been the same if complete political agreement had existed from the start. At the outbreak of war the average Spanish factory-worker did not even know how to fire a rifle (there had never been universal conscription in Spain), and the traditional pacifism of the Left was a great handicap. The thousands of foreigners who served in Spain made good infantry, but there were very few experts of any kind among them. The Trotskyist thesis that the war could have been won if the revolution had not been sabotaged was probably false. To nationalize factories, demolish churches, and issue revolutionary manifestoes would not have made the armies more efficient. The Fascists won because they were the stronger; they had modern arms and the others hadn't. No political strategy could offset that.
The most baffling thing in the Spanish war was the behaviour of the great powers. The war was actually won for Franco by the Germans and Italians, whose motives were obvious enough. The motives of France and Britain are less easy to understand. In 1936 it was clear to everyone that if Britain would only help the Spanish Government, even to the extent of a few million pounds’ worth of arms, Franco would collapse and German strategy would be severely dislocated. By that time one did not need to be a clairvoyant to foresee that war between Britain and Germany was coming; one could even foretell within a year or two when it would come. Yet in the most mean, cowardly, hypocritical way the British ruling class did all they could to hand Spain over to Franco and the Nazis. Why? Because they were pro-Fascist, was the obvious answer. Undoubtedly they were, and yet when it came to the final showdown they chose to stand up to Germany. It is still very uncertain what plan they acted on in backing Franco, and they may have had no clear plan at all. Whether the British ruling class are wicked or merely stupid is one of the most difficult questions of our time, and at certain moments a very important question.

Rights expert urges the UN General Assembly to adopt a more decisive role in peace-making (For International Day of Peace, Saturday 21 September 2013) http://dezayasalfred.wordpress.com/2013/09/26/rights-expert-urges-the-un-general-assembly-to-adopt-a-more-decisive-role-in-peace-making-for-international-day-of-peace-saturday-21-september-2013/.
2013, 2013 - International Peace Day

Employment of Naval Forces (1948)
Context: Our present undisputed control of the sea was achieved primarily through the employment of naval air-sea forces in the destruction of Japanese and German sea power. It was consolidated by the subsequent reduction of these nations to their present impotence, in which the employment of naval air-sea forces against land objectives played a vital role. It can be perpetuated only through the maintenance of balanced naval forces of all categories adequate to our strategic needs (which include those of the non-totalitarian world), and which can flexibly adjust to new modes of air-sea warfare and which are alert to develop and employ new weapons and techniques as needed.

A paraphrased variant of this seems to have arisen on the internet around 2007: It is ... a settled policy of America, that as peace is better than war, war is better than tribute. The United States, while they wish for war with no nation, will buy peace with none.
1810s
Source: Message delivered to Dey Omar Agha, by Isaac Chauncey and William Shaler , summarizing the Treaty with Algiers (1815) http://avalon.law.yale.edu/19th_century/bar1815t.asp, and U.S attitudes and actions in the Barbary Wars, in refusing to pay ransom or tribute to pirates of the Barbary States, as quoted in History and Present Condition of Tripoli: With Some Accounts of the Other Barbary States http://books.google.com/books?id=YMwRAAAAYAAJ&pg=PA46 (1835) by Robert Greenhow, p. 46

The Ballad of the King's Jest, Stanza 4
Other works