"Feeling gratitude and not expressing it is like wrapping a present and not giving it." - William Arthur Ward

Gratitude Quotations
http://www.wisdomquotes.com/cat_gratitude.html

Wikipedia: Gratitude
http://en.wikipedia.org/wiki/Gratitude

Quotations about Gratitude
http://www.quotegarden.com/gratitude.html

The Power of Gratitude
http://www.abundance-and-happiness.com/gratitude.html