Positive, optimistic sales people sell more than pessimistic sales people.

Positive thinking is the notion that if you think good thoughts, things will work out well. Optimism is the feeling of thinking things will be well and be hopeful.

Doing a kindness produces the single most reliable momentary increase in well-being of any exercise we have tested.

I'm trying to broaden the scope of positive psychology well beyond the smiley face. Happiness is just one-fifth of what human beings choose to do.

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.

Optimism is a tool with a certain clear set of benefits: it fights depression, it promotes achievement and produces better health.

Optimism is invaluable for the meaningful life. With a firm belief in a positive future, you can throw yourself into the service of that which is larger than you are.