What are the facts? Again and again and again—what are the facts? Shun wishful thinking, ignore divine revelation, forget what "the stars foretell," avoid opinion, care not what the neighbors think, never mind the unguessable "verdict of history"; what are the facts, and to how many decimal places? You pilot always into an unknown future; facts are your single clue. Get the facts!
Robert Heinlein (1907 - 1988)
Source: Time Enough for Love, The Notebooks of Lazarus Long
It is no crime to be ignorant of economics, which is, after all, a specialized discipline and one that most people consider to be a 'dismal science.' But it is totally irresponsible to have a loud and vociferous opinion on economic subjects while remaining in this state of ignorance.
Some individuals have developed such strong internal standards that they no longer need the opinion of others to judge whether they have performed a task well or not. The ability to give objective feedback to oneself is in fact the mark of the expert.
Source: Good Business : Leadership, Flow, and the Making of Meaning, Pages: 43
. . . The slogan "You are entitled to your opinion" is so often repeated that is near impossible for the brain of a modern Westerner not to have absorbed it.
Like many other views that have at times enjoyed universal assent, however, it isn't true. You don't really have the right to your own opinions. And the idea that you do, beside being false, is forever being invoked when it would be irrelevant even if it were true.