David Schwartz

“If someone doesn't value evidence, what evidence are you going to provide to prove that they should value it? If someone doesn’t value logic, what logical argument could you provide to show the importance of logic?”
― Sam Harris

“The absence of evidence is not the evidence of absence.”
― Carl Sagan, Cosmos

“...and when is enough proof enough?”
― Jonathan Safran Foer, Everything is Illuminated

“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.”
― Bertrand Russell, Marriage and Morals