It may not be impossible, but that our Faculties may be so construed, as always to deceive us in the things we judge most certain and assured. Joseph Glanvill
It seemed, however, that his poor injured brain had been working in the interval, for when he was quite conscious, he looked at me piercingly with an agonized confusion which I shall never forget, and said, I must not deceive myself.
Machiavellianism is also a term that some social and personality psychologists use to describe a person's tendency to deceive and manipulate others for personal gain.
The best way in the world to deceive believers is to cloak a message in religious language and declare that it conveys some new insight from God. Charles Stanley
There are few things in which we deceive ourselves more than in the esteem we profess to entertain for our firends. It is little better than a piece of quackery. The truth is, we think of them as we please, that is, as they please or displease us. William Hazlitt