In your own life, you should take particular care with endings, for their color will forever tinge your memory of the entire relationship and your willingness to reenter it.
Martin SeligmanOne of the things psychologists used to say was that if you are depressed, anxious or angry, you couldn't be happy. Those were at opposite ends of a continuum. I believe that you can be suffering or have a mental illness and be happy - just not in the same moment that you're sad.
Martin SeligmanNot only do happy people endure pain better and take more health and safety precautions when threatened, but positive emotions undo negative emotions.
Martin Seligman