Essentially, humans are bad at knowing what will make them happy in the future, and bad at remembering what made them happy in the past. We have 'flawed' memories and 'flawed' imaginations. The only real advice he gave was to only ask for advice from people currently in the situation you are considering that you think would make you happy, but even that presupposes the ability to accurately assess and relay ones current emotional state, and given that he sheds doubt on humans' abilities to do even that in the early chapters, I don't see how this book was terribly inspiring. Perhaps the knowledge that our brains don't see all ends when imagining the future is helpful, but not a very profound observation.
