“But if philosophy is to serve a positive purpose, it must not teach mere skepticism, for, while the dogmatist is harmful, the skeptic is useless. Dogmatism and skepticism are both, in a sense, absolute philosophies; one is certain of knowing, the other of not knowing. What philosophy should dissipate is certainty, whether of knowledge or of ignorance.”

— Bertrand Russell

1940s, Philosophy for Laymen (1946)
Context: The demand for certainty is one which is natural to man, but is nevertheless an intellectual vice. If you take your children for a picnic on a doubtful day, they will demand a dogmatic answer as to whether it will be fine or wet, and be disappointed in you when you cannot be sure. The same sort of assurance is demanded, in later life, of those who undertake to lead populations into the Promised Land. “Liquidate the capitalists and the survivors will enjoy eternal bliss.” “Exterminate the Jews and everyone will be virtuous.” “Kill the Croats and let the Serbs reign.” “Kill the Serbs and let the Croats reign.” These are samples of the slogans that have won wide popular acceptance in our time. Even a modicum of philosophy would make it impossible to accept such bloodthirsty nonsense. But so long as men are not trained to withhold judgment in the absence of evidence, they will be led astray by cocksure prophets, and it is likely that their leaders will be either ignorant fanatics or dishonest charlatans. To endure uncertainty is difficult, but so are most of the other virtues. For the learning of every virtue there is an appropriate discipline, and for the learning of suspended judgment the best discipline is philosophy.
But if philosophy is to serve a positive purpose, it must not teach mere skepticism, for, while the dogmatist is harmful, the skeptic is useless. Dogmatism and skepticism are both, in a sense, absolute philosophies; one is certain of knowing, the other of not knowing. What philosophy should dissipate is certainty, whether of knowledge or of ignorance.

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Bertrand Russell562

logician, one of the first analytic philosophers and politi… 1872–1970

Paul Guyer (1948) American philosopher

Kant (2006; 2014), Introduction

“The skeptical view appears to me out of harmony with the inductive philosophy.”

Robert Chambers (publisher, born 1802) (1802–1871) Scottish publisher and writer

Source: Testimony: its Posture in the Scientific World (1859), p. 8
Context: The skeptical view appears to me out of harmony with the inductive philosophy. Bacon gives us many warnings against preconceived opinions and prejudices; but he does not bid us despair of ascertaining facts from our own senses and from testimony.... we do not find in Bacon any dogma like that of Mr. Faraday that the 'laws of nature are the foundation of our knowledge in natural things,' and that these form our only safe test for any new fact presented to our observation. Bacon's method is rather the contrary, namely, that facts are to serve as the foundation of the laws of nature.

“When one admits that nothing is certain one must, I think, also admit that some things are much more nearly certain than others. It is much more nearly certain that we are assembled here tonight than it is that this or that political party is in the right. Certainly there are degrees of certainty, and one should be very careful to emphasize that fact, because otherwise one is landed in an utter skepticism, and complete skepticism would, of course, be totally barren and completely useless.”

Bertrand Russell (1872–1970) logician, one of the first analytic philosophers and political activist

"Skepticism" <br class="br">1940s, Am I An Atheist Or An Agnostic? http://www.positiveatheism.org/hist/russell8.htm (1947)

“The permanent mental attitude which the sensitive intelligence derives from philosophy is an attitude that combines extreme reverence with limitless skepticism.”

John Cowper Powys (1872–1963) British writer, lecturer and philosopher

Source: The Meaning of Culture (1929), pp. 27-28

“The only wisdom I think I've attained is the wisdom to be skeptical of other people's ideology and other people's arguments. I tend to be a skeptic, I don't like dogmatic approaches by anybody.”

Joseph Heller (1923–1999) American author

In an interview for the Australian Broadcasting Corporation: "Joseph Heller - Closing Time" (1998) by Ramona Koval http://web.archive.org/web/20000306044602/http://www.abc.net.au/rn/arts/bwriting/heller.htm  <br class="br">Context: The only wisdom I think I've attained is the wisdom to be skeptical of other people's ideology and other people's arguments. I tend to be a skeptic, I don't like dogmatic approaches by anybody. I don't like intolerance and a dogmatic person is intolerant of other people. It's one of the reasons I keep a distance from all religious beliefs. I think in this country and in Australia too there's a late intolerance in most religions, an intolerance, a part that could easily become persecutions.<br>We have some ultra-orthodox Jewish sects here in New York and I fear them as much as I would fear a Nazi organisation.

“…I made the statement off and on for 10-11 years that the abundance of knowledge, the abundance of information, will not lead to certainty; it will lead to pervasive skepticism. And, folks, that's exactly what has happened. It's like this. How do you really know, there is so much out there… This abundance has led to skepticism. And then the Internet has leveled the playing field.”

Josh McDowell (1939) American writer

[Apologist Josh McDowell: Internet the Greatest Threat to Christians, Christian Post, 2011-07-16, Anugrah, Kumar, http://www.christianpost.com/news/apologist-josh-mcdowell-internet-the-greatest-threat-to-christians-52382/, 2011-10-21]