This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...n perception and the rationality of the course one chooses to pursue. It makes a difference whether one thinks that one is dealing with human errors of knowledge or with human evil.
read full book
> Observe how many people evade, rationalize and drive their minds into a state of blind stupor, in dread of discovering that those they deal with — their “loved ones” or friends or busine
ss associates or political rulers — are not merely mistaken, but evil. Observe that this dread leads them to sanction, to help and to spread the very evil whose existence they fear to acknowle...