Carl Sagan on Arguments from Authority in Science

One of the great commandments of science is, “Mistrust arguments from authority.” (Scientists, being primates, and thus given to dominance hierarchies, of course do not always follow this commandment). Too many such arguments have proved too painfully wrong. Authorities must prove their contentions like everybody else.

Carl Sagan, The Demon-Haunted World, 2011, p. 28.

John Stuart Mill On Censorship

The peculiar evil of silencing the expression of opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. If the opinion is right, they are deprived of the opportunity of exchanging error for truth: if wrong, they lose, what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error.

–John Stuart Mill, On Liberty, 1859