“The Deep Slumber of a Decided Opinion.”

by expoƒunction

“… and what was understood would have been far more deeply impressed on the mind, if the man had been accustomed to hear it argued pro and con by people who did understand it. The fatal tendency of mankind to leave off thinking about a thing when it is no longer doubtful, is the cause of half their errors. A contemporary author has well spoken of “the deep slumber of a decided opinion.””

John Stuart Mill
On Liberty, Ch II. 1859