"If a belligerent cannot retaliate against an enemy without injuring the lives of neutrals as well as their property, humanity, as well as justice and a due regard for the dignity of neutral powers, should dictate that the practice be discontinued. If persisted in it would in such circumstances constitute an unpardonable offense against the sovereignty of the neutral nation affected. . . . The rights of neutrals in time of war are based upon principle, not upon expediency, and the principles are immutable. It is the duty and obligation of belligerents to find a way to adapt the new circumstances to them." (The Secretary of State, Washington, D. C., to the German Minister for Foreign Affairs, July 21, 1915.) "The law of nations in these matters, upon which the Government of the United States based that protest" (i.e., against the German declaration of February, 1915, declaring the danger zone around Great Britain and Ireland) "is not of recent origin or founded upon merely arbitrary principles set up by convention. It is based, on the contrary, upon manifest principles of humanity and has long been established with the approval and by the express assent of all civilized nations. . . . It has become painfully evident to it (the Government of the United States) that the position which it took at the very outset is inevitable, namely--the use of submarines for the destruction of an enemy's commerce is, of necessity, because of the very character of the vessels employed and the very methods of attack which their employment of course involves, utterly incompatible with the principles of humanity, the long-established and incontrovertible rights of neutrals, and the sacred immunities of non-combatants." (The Secretary of State, Washington, D. C., to the German Minister for Foreign Affairs, April 18, 1916.) "But we cannot forget that we are in some sort and by the force of circumstances the responsible spokesmen of the rights of humanity, and that we cannot remain silent while those rights seem in process of being swept away in the maelstrom of this terrible war. We owe it to a due regard for our own rights as a nation, to our sense of duty as a representative of the rights of neutrals the world over, and to a just conception of the rights of mankind to take this stand now with the utmost solemnity and firmness." (President Wilson's Address to Congress, April 19, 1916.) "The present German warfare against commerce is a warfare against mankind. It is a war against all nations. American ships have been sunk, American lives taken, in ways which it has stirred us very deeply to learn of, but the ships and people of other neutral and friendly nations have been sunk and overwhelmed in the waters in the same way. There has been no discrimination. The challenge is to all mankind. Each nation must decide for itself how it will meet it." (President Wilson's Message to Congress, April 2, 1917.)