“Ignore the critics… Only mediocrity is safe from ridicule. Dare to be different!”

Section 124
Reflections on the Human Condition (1973)
Context: The ignorant are a reservoir of daring. It almost seems that those who have yet to discover the known are particularly equipped for dealing with the unknown. The unlearned have often rushed in where the learned feared to tread, and it is the credulous who are tempted to attempt the impossible. They know not whither they are going, and give chance a chance.

Nationally syndicated column number 90, From Nuts To The Soup (31 August 1924); published in The New York Times http://select.nytimes.com/gst/abstract.html?res=F50A12F83D551B7A93C3AA1783D85F408285F9 <br class="br">Weekly columns <br class="br">Variant: Everybody is ignorant, only on different subjects.

Source: Clockwork Angel

The Story of Australia's People: The Rise and Rise of a New Australia (2016)

Wellsprings : A Book of Spiritual Exercises (1985), p. 19
Context: "I wish to become a teacher of the Truth."
"Are you prepared to be ridiculed, ignored and starving till you are forty-five?"
"I am. But tell me: What will happen after I am forty-five?"
"You will have grown accustomed to it."

As quoted in What Great Men Think of Religion (1972 [1945]) by Ira D. Cardiff, p. 245. Actually said by Edward Gibbonː "The various modes of worship, which prevailed in the Roman world, were all considered by the people, as equally true; by the philosopher, as equally false; and by the magistrate, as equally useful." (The History of the Decline and Fall of the Roman Empire, 1776, Vol. I, Ch. II).
Misattributed

Letter to A.W.M. Baillie (10 September 1864)
Letters, etc