A human will find it easy to believe what the human would like to believe.
In others, when presenting an idea, if you want it accepted, then express it in a way that they would like it to be true. “Now this snake oil may not make you look like Robert Redford, but it will help to bring out the handsome devil you really are inside.”
In yourself, always be chary of thinking you’ve got it right, just because you’d like it to be that way. And if you’d really, really like it to be that way, check your facts twice!
Knowing this important secret of the universe, go forth and prosper.