if, like many people, you tend to be vaguely unhappy much of the time, it can be very helpful to manufacture a feeling of gratitude by simply contemplating all the terrible things that have not happened to you, or to think of how many people would consider their prayers answered if they could only live as you are now. The mere fact that you have the leisure to read this book puts you in very rarefied company. Many people on earth at this moment can't even imagine the freedom that you currently take for granted.