Confirmation bias is a subtle but major force. As the psychologist Raymond Nickerson puts it: “If one were to attempt to identify a single problematic aspect of human reasoning that deserves attention above all others, the confirmation bias would have to be among the candidates for consideration” (Nickerson 1998, 175).

Sönke Ahrens, How to take smart notes: One simple technique to boost writing, learning and thinking – for students, academics and nonfiction book writers, Scotts Valley, CA, 2017, p. 87