“A man who is certain he is right is almost sure to be wrong.”

“When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.”

“Surely it is the one who fears he is wrong who avoids criticism. The one who is sure he is right invites it. It only illuminates the strength of beliefs and makes them more available to others.”

“They know that people need witches; they need the unofficial people who understand the difference between right and wrong, and when right is wrong and when wrong is right. The world needs the people who work around the edges. They need the people who can deal with the little bumps and inconveniences. And little problems. After all, we are almost all human. Almost all of the time.”

“By the time a man realises that maybe his father was right, he usually has a son who thinks he is wrong.”

“A man who is good for anything ought not to calculate the chance of living or dying; he only ought to consider whether he is doing right or wrong.”