A few weeks ago, while trying to define happiness, she said: "The only way to be happy is to be of service to another.

Since this is the case we should be aware of limits in attempting to define, quantify or track well-being or happiness.

He defines happiness as "an abstract, moral concept.

For example, a researcher might try to use job satisfaction to define overall happiness.

A variety of biological, psychological, religious, and philosophical approaches have striven to define happiness and identify its sources.

Philosophers and religious thinkers often define happiness in terms of living a good life, or flourishing, rather than simply as an emotion.

Psychologists have defined happiness as a combination of life satisfaction and the relative frequency of positive and negative affect.

And Tennessee Williams once famously defined happiness as "insensitivity."

The characteristics that are looked for in happiness seem also, all of them, to belong to what we have defined happiness as being.

The dictionary defines happiness as a feeling of pleasure or contentment.