Your brain preferentially scans for, registers, stores, recalls, and reacts to unpleasant experiences…. Even when positive experiences outnumber negative ones, the pile of negative implicit memories naturally grows faster. Then the background feeling of what it feels like to be you can become undeservedly glum and pessimistic.
The remedy is not to suppress negative experiences; when they happen, they happen. Rather, it is to foster positive experiences-- and in particular, to take them in so they become a permanent part of you.
-- Buddha's Brain, p.68
