“If appearances are deceitful, then they do not deserve any confidence when they assert what appears to them to be true.”
Pyrrho, 11.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 9: Uncategorized philosophers and Skeptics
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Diogenes Laërtius 107
biographer of ancient Greek philosophers 180–240Related quotes

“Half of confidence is the appearance of confidence.”
Source: Dreams of Steel (1990), Chapter 17 (p. 287)

"I am widely regarded as the ghost of a writer," (1977), from New Selected Essays: Where I Live, ed. John S. Bak and John Lahr (New Directions Publishing, 2009)
“Not everything that appears true is true.”
"6/24/95 Wendy Kaminer on Crime" (24 June 1995)
Context: Not everything that appears true is true. The ACLU is devoted to some very controversial principles — like the principle that everyone who is arrested should enjoy the same constitutional rights, regardless of their alleged crime or their character. We don't take that position to irritate people; we take that position because we believe in it. We believe in it, in part, in a spirit of enlightened self-interest, because the rights of each one of us are co-extensive with the rights of everyone who is arrested and prosecuted in the criminal courts. If we all don't enjoy the same rights, then no one enjoys any rights at all; some of us merely enjoy privilege.

1980s and later, "Two Pages of Fiction" (1982)
“Commerce and Culture,” p. 285.
Giants and Dwarfs (1990)