Dissonance

"The more costly a decision, in terms of time, money, and inconvenience, and the more irrevocable its consequences, the greater the dissonance and the greater need to reduce it by overemphasizing the good things about the choice made."

Michael Webster summaries a key point from the book:

"Mistakes were made, but not by me"


In simple terms, cognitive dissonance can be the filtering of information that conflicts with what one already believes, in an effort to ignore that information and reinforce one's beliefs.