“And I think, in the end, that is the best definition of journalism I have heard; to challenge authority - all authority - especially so when governments and politicians take us to war, when they have decided that they will kill and others will die.”

From an interview. Reported in The Vegetarian Magazine, Volume 11, Issue 2 https://books.google.it/books?id=PjugAAAAMAAJ, 1907, p. 22.

Preface to the 1913 edition
1890s, Quintessence Of Ibsenism (1891; 1913)
Context: I have never admitted the right of an elderly author to alter the work of a young author, even when the young author happens to be his former self. In the case of a work which is a mere exhibition of skill in conventional art, there may be some excuse for the delusion that the longer the artist works on it the nearer he will bring it to perfection. Yet even the victims of this delusion must see that there is an age limit to the process, and that though a man of forty-five may improve the workmanship of a man of thirty-five, it does not follow that a man of fifty-five can do the same.
When we come to creative art, to the living word of a man delivering a message to his own time, it is clear that any attempt to alter this later on is simply fraud and forgery. As I read the old Quintessence of Ibsenism I may find things that I see now at a different angle, or correlate with so many things then unnoted by me that they take on a different aspect. But though this may be a reason for writing another book, it is not a reason for altering an existing one.

Source: Starship Troopers

Political Order in Changing Societies https://projects.iq.harvard.edu/files/gov2126/files/huntington_political_order_changing_soc.pdf (1968), p. 7

A Retort, from Gerald Massey's Lectures c.1900; often cited as They must find it difficult, those who have taken authority as truth, rather than truth as authority.
Based on a quote of Lucretia Mott, "… my convictions led me to adhere to the sufficiency of the light within us, resting on truth as authority, rather than “taking authority for truth.”", quoted in " Eminent women of the age http://books.google.de/books?id=gGFEDpWYWpwC&pg=PA375" By James Parton et. al., (S.M. Betts & Company, 1868, p375).

Criticism "goes with the territory"

Speech to the Constitutional Convention (September 17, 1787); reported in James Madison, Journal of the Federal Convention, ed. E. H. Scott (1893), p. 742.
Constitutional Convention of 1787

Source: 1920s, Sceptical Essays (1928), Ch. 13: Freedom in Society