“History is full of religious wars; but, we must take care to observe, it was not the multiplicity of religions that produced these wars, it was the intolerating spirit which animated that one which thought she had the power of governing.”

Source: Christianity and the Social Crisis (1907), Ch.4 Why Has Christianity Never Undertaken the Work of Social Reconstruction?, p. 149

Ibid.

Christianity and Patriotism (1895), as translated in The Novels and Other Works of Lyof N. Tolstoï, Vol. 20, p. 44
Context: In all history there is no war which was not hatched by the governments, the governments alone, independent of the interests of the people, to whom war is always pernicious even when successful.
The government assures the people that they are in danger from the invasion of another nation, or from foes in their midst, and that the only way to escape this danger is by the slavish obedience of the people to their government. This fact is seen most prominently during revolutions and dictatorships, but it exists always and everywhere that the power of the government exists. Every government explains its existence, and justifies its deeds of violence, by the argument that if it did not exist the condition of things would be very much worse. After assuring the people of its danger the government subordinates it to control, and when in this condition compels it to attack some other nation. And thus the assurance of the government is corroborated in the eyes of the people, as to the danger of attack from other nations.

Socialism (1922), Epilogue (1947)
Context: When people were committed to the idea that in the field of religion only one plan must be adopted, bloody wars resulted. With the acknowledgment of the principle of religious freedom these wars ceased. The market economy safeguards peaceful economic co-operation because it does not use force upon the economic plans of the citizens. If one master plan is to be substituted for the plans of each citizen, endless fighting must emerge. Those who disagree with the dictator's plan have no other means to carry on than to defeat the despot by force of arms.

Twilight of the Idols (1888)

The Future of Civilization (1938)
Context: When one comes to try and analyse why the League succeeded so well in its first ten years of existence, no doubt the chief reason must be found in the immense horror which the War of 1914 had created amongst the human race. Almost all those engaged in the work at Geneva had personal knowledge of the vast slaughter and destruction which the war had produced. Many had been face to face with what looked like a vivid danger of relapse into barbarism in their own countries, and there was a tremendous urge to discover some effective prevention of future wars. It was under the impulse of these feelings that we worked in those days and that we made our appeal, not in vain, for the support of the public opinion of the world.

Source: Letters On a Regicide Peace (1796), p. 19

Diary (6 April 1886)
Diary and Letters of Rutherford Birchard Hayes (1922 - 1926)