"The problem is, the phrase is dead wrong. Hindsight is not 20-20. Not even close. Our view of the past, in fact, is hardly clearer than our view of the future. While we know more about a past event than a future one, our understanding of the factors that shaped it is severely limited. Not only that, because we think we see what happened clearly--hindsight being 20-20 and all--we often aren't open to knowing more. "We should be careful to get out of an experience only the wisdom that is in it--and stop there," as Mark Twain once said, "lest we be like the cat that sits down on a hot stove-lid. She will never sit down on a hot stove-lid again--and that is well; but also she will never sit down on a cold one anymore." The cat's hindsight, in other words, distorts her view. The past should be our teacher, not our master."