If our well-being depends upon the interaction between events in our brains and events in the world, and there are better and worse ways to secure it, then some cultures will tend to produce lives that are more worth living than others; some political persuasions will be more enlightened than others; and some world views will be mistaken in ways that cause needless human misery.
Meditation has made me happy, loving, and peaceful-but not every single moment of the day. I still have good times and bad, joy and sorrow. Now I can accept setbacks more easily, with less sense of disappointment and personal failure, because meditation has taught me how to cope with the profound truth that everything changes all the time.