Bigotry and science can have no communication with each other, for science begins where bigotry and absolute certainty end. The scientist believes in proof without certainty, the bigot in certainty without proof. Let us never forget that tyranny most often springs from a fanatical faith in the absoluteness of one’s beliefs.

Ashley Montagu (1905-1999) British-American anthropologist and humanist [b. Israel Ehrenberg, a/k/a Montague Francis Ashley-Montagu]

Science and Creationism, Introduction (1984)

The second sentence is frequently (mis)quoted:

• "Science has proof without any certainty. Creationists have certainty without any proof."
• "Religion gives us certainty without proof; science gives us proof without certainty."