We will get bored if we spend our days incessantly asking ourselves whether we still remember our friend Edward’s name. It’s too easy, it’s tedious, and it doesn’t work very well. If we wait longer—until we’re just about to forget—then remembering Edward’s name becomes a stimulating challenge. We’re aiming for the point where a dash of difficulty will provide just the right amount of spice and keep the game interesting. If we can find it, we’ll get twice as much benefit for our time, and we’ll have much more fun in the process.
