The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd; indeed in view of the silliness of the majority of mankind, a widely spread belief is more likely to be foolish than sensible.
Interpretation
Popularity does not equate to truth; commonly held beliefs can often be foolish.
In this quote, Bertrand Russell emphasizes that just because a belief is widely accepted does not mean it is valid or sensible. He critiques the tendency of people to accept popular opinions without questioning their validity, suggesting that the majority often lacks wisdom, thus making commonly held beliefs potentially misguided or absurd.
In practice
In a debate about climate change, you could use this quote to challenge popular misconceptions.
St. Paul introduced an entirely novel view of marriage, that it existed primarily to prevent the sin of fornication. It is just as if one were to maintain that the sole reason for baking bread is to prevent people from stealing cake.
Freedom comes only to those who no longer ask of life that it shall yield them any of those personal goods that are subject to the mutations of time.
Of these austerer virtues the love of truth is the chief, and in mathematics, more than elsewhere, the love of truth may find encouragement for waning faith. Every great study is not only an end in itself, but also a means of creating and sustaining a lofty habit of mind; and this purpose should be kept always in view throughout the teaching and learning of mathematics.
At all times, except when a monarch could enforce his will, war has been facilitated by the fact that vigorous males, confident of victory, enjoyed it, while their females admired them for their prowess.
Moreover, the attitude that one ought to believe such and such a proposition, independently of the question whether there is evidence in its favor, is an attitude which produces hostility to evidence and causes us to close our minds to every fact that does not suit our prejudices.
Extreme hopes are born from extreme misery.
The river itself has no beginning or end. In its beginning, it is not yet the river; in the end it is no longer the river. What we call the headwaters is only a selection from among the innumerable sources which flow together to compose it. At what point in its course does the Mississippi become what the Mississippi means?
You can neither lie to a neighbourhood park, nor reason with it. 'Artist's conceptions' and persuasive renderings can put pictures of life into proposed neighbourhood parks or park malls, and verbal rationalizations can conjure up users who ought to appreciate them, but in real life only diverse surroundings have the practical power of inducing a natural, continuing flow of life and use.
I had a thought, on the way home from the rock field, that the things we don't know about a person are the things that make them human, and it made me feel sad to think that, but sad in that reassuring way that some sadness has, a sadness that says welcome home in twelve different languages.
Living is death; dying is life. We are not what we appear to be. On this side of the grave we are exiles, on that citizens; on this side orphans, on that children.
Solitary confinement is too terrible a punishment to inflict on any human being, no matter what his crime. Hardened criminals in the men's prisons, it is said, often beg for the lash instead.
Someday, I have no doubt, the dead from today's wars will be seen with a similar sense of sorrow at needless loss and folly as those millions of men who lie in the cemeteries of France and Belgium - and tens of millions of Americans will feel a similar revulsion for the politicians and generals who were so spendthrift with others' lives.
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