“Why, what is the matter with us? Are we going to palliate and excuse a palpable and flagrant outrage on the right of speech, by implying that only a particular description of persons should exercise that right? Are we, at such a time, when a great principle has been struck down, to quench the moral indignation which the deed excites, by casting reflections upon those on whose persons the outrage has been committed? After all the arguments for liberty to which Boston has listened for more than a quarter of a century, has she yet to learn that the time to assert a right is the time when the right itself is called in question, and that the men of all others to assert it are the men to whom the right has been denied?”

The Study of History (1895)
Context: Most of this, I suppose, is undisputed, and calls for no enlargement. But the weight of opinion is against me when I exhort you never to debase the moral currency or to lower the standard of rectitude, but to try others by the final maxim that governs your own lives, and to suffer no man and no cause to escape the undying penalty which history has the power to inflict on wrong. The plea in extenuation of guilt and mitigation of punishment is perpetual. At every step we are met by arguments which go to excuse, to palliate, to confound right and wrong, and reduce the just man to the level of the reprobate. The men who plot to baffle and resist us are, first of all, those who made history what it has become. They set up the principle that only a foolish Conservative judges the present time with the ideas of the past; that only a foolish Liberal judges the past with the ideas of the present.

Quod aliquantum (10 March 1791), quoted in André Latreille and Joseph E. Cunneen, 'The Catholic Church and the Secular State: The Church and the Secularization of Modern Societies', CrossCurrents Vol. 13, No. 2 (Spring 1963), pp. 220–221

Qui se laisse outrager, mérite qu'on l'outrage
Et l'audace impunie enfle trop un courage.
Heraclius, act I, scene II.

Source: A Theory of Justice (1971; 1975; 1999), p. 217

Popular Government: Its Essence, Its Permanence and Its Perils, chapter 4, p.90 (1913).

The American Commonwealth: Volume II (New York: The Macmillan Company, 1910), p. 810.
1910s

As quoted in "First African American Senator" http://www.senate.gov/artandhistory/history/minute/First_African_American_Senator.htm, United States Senate

Speech https://api.parliament.uk/historic-hansard/commons/1938/oct/05/policy-of-his-majestys-government#S5CV0339P0_19381005_HOC_216 in the House of Commons (5 October 1938) against the Munich Agreement
The 1930s

Source: The Basis of Morality