Charles Mathewes (emphasis mine):

This, I submit, is the danger we face: a willed blindness to the basic character of our situation. It is a fundamental human flaw throughout history, but it is an especially prevalent problem today. To correct for it, you must learn, patiently and meticulously, to notice the world for what it is, recognizing not just the things you expect to see there, but also those things that do not fit into your expectations. And that means you will never be able fully to affirm one thing—the contrary examples will serve as a counterpoint, to perforate any too-seamless confidence. That in turn entails that honest apprehension of our condition will never be wholeheartedly on one side or the other of anything.