“One could not be a successful scientist without realizing that, in contrast to the popular conception supported by newspapers and mothers of scientists, a goodly number of scientists are not only narrow-minded and dull, but also just stupid.”

as quoted by Gordon Shrum. In an article by Robert Craig Brown, The life of Sir John Cunningham McLennan http://www.physics.utoronto.ca/overview/history/mclennan, Physics in Canada, March / April 2000.

Ryōji Noyori (2018) cited in " Diverse culture, free environment keys for Nobel prizes: Nobel winner http://focustaiwan.tw/news/ast/201805090001.aspx" on Focus Taiwan, 9 May 2018.

Source: What Is Life? with Mind and Matter and Autobiographical Sketches

Succeeding in Science: Some Rules of Thumb (1993)
Context: To make a huge success, a scientist must be prepared to get into deep trouble. Sometime or another, someone will tell you that you are not ready to do something. … If you are going to make a big jump in science, you will very likely be unqualified to succeed by definition. The truth, however, won't save you from criticism. Your very willingness to take on a very big goal will offend some people who will think that you are too big for your britches and crazy to boot.

Christian Science Monitor (24 July 1986)

"The Reach of Imagination" (1967)

The second sentence is often misquoted as “Science has proof without any certainty. Creationists have certainty without any proof.” or “Religion gives us certainty without proof; science gives us proof without certainty.”
Context: 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.

“We won’t know until we try,” Naqi said. Any other answer would have been politically hazardous: too much optimism and the politicians would have started asking just why the expensive project was needed in the first place. Too much pessimism and they would ask exactly the same question.

Turquoise Days, Chapter 2 (pp. 240-241)
Short fiction, Diamond Dogs, Turquoise Days (2003)

Source: Timelike Infinity (1992), Chapter 7 (p. 218)