I still haven't found what I'm looking for...

"And if you look a little closer, you’ll see that if a person believes that life is terrible, they’ll constantly look for proof of this, to confirm their view of the world. They’ll find quotes and situations and events in their life and magnify them a hundred times. If a person believes that life is wonderful, they’ll look for the corresponding signage and behave in a similar manner to the previous person with their view of the world. Often, this is the same person on different days of the week."