The philosophical options—vetting our beliefs to figure out if they are justified, true, necessary, and so forth—are controversial even among philosophers, and impractical as a way to get through life. And the lay option—relying on the feeling of knowing, and trusting the theories that so constantly come to mind—leads us too easily into error. In other words, we have no sound method for knowing what we know—which means that, strictly speaking, we don’t know much of anything.
