Quote by Bertrand Russell
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.

Summary
This quote highlights the fallacy in assuming that the popularity of an opinion signifies its validity or rationality. It suggests that just because a belief is widely held does not make it any less absurd. In fact, given the tendency for people to hold nonsensical views, a widely spread belief is more likely to be foolish than sensible. It serves as a reminder to not blindly accept common beliefs, but instead to critically examine them for their logical coherence and soundness.