Success requires persistence, the ability to not give up in the face of failure. I believe that optimistic explanatory style is the key to persistence.
Martin SeligmanDoing a kindness produces the single most reliable momentary increase in well-being of any exercise we have tested.
Martin SeligmanIn 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 Seligman