Some wonderful quotes on gratitude and being grateful:

"Gratitude is the most fruitful way of deepening your consciousness that you are...a divine choice." -- Henri Nouwen

"Let gratitude be the pillow upon which you kneel to say your nightly prayer.  And let faith be the bridge you build to overcome evil and welcome good."
-- Maya Angelou, Celebrations: Rituals of Peace and Prayer

"Piglet noticed that even though he had a Very Small Heart, it could hold a rather large amount of Gratitude."
-- A.A. Milne, Winnie-the-Pooh

"In ordinary life we hardly realize that we receive a great deal more than we give, and that it is only with gratitude that life becomes rich."
-- Dietrich Bonhoeffer

"The unthankful heart discovers no mercies; but the thankful heart will find, in every hour, some heavenly blessings."
-- Henry Ward Beecher

"…thanking God is a sign of humility.  When we thank God, we are admitting that we are dependent on Him."
-- Pastor Joe

"As we express our gratitude, we must never forget that the highest appreciation is not to utter words, but to live by them."
-- John F. Kennedy

"The miracle of gratitude is that it shifts your perception to such an extent that it changes the world you see."
-- Dr. Robert Holden

"Gratitude is not only the greatest of virtues, but the parent of all the others."
-- Cicero

"We can only be said to be alive in those moments when our hearts are conscious of our treasures."
-- Thornton Wilder

"Gratitude is the sign of noble souls."
-- Aesop

"Gratitude, like faith, is a muscle.  The more you use it, the stronger it grows, and the more power you have to use it…To be grateful is to find blessings in everything.  This is the most powerful attitude to adopt, for there are blessings in everything."
-- Alan Cohen

"Gratitude is the ability to experience life as a gift.  It liberates us from the prison of self-preoccupation."
-- John Ortberg

"Gratitude bestows reverence, allowing us to encounter everyday epiphanies, those transcendent moments of awe that change forever how we experience life and the world."
-- John Milton

"There are only two ways to live your life.  One is as though nothing is a miracle.  The other is as though everything is a miracle."
-- Albert Einstein

"Gratitude doesn't change the scenery.  It merely washes clean the glass you look through so you can clearly see the colors."
-- Richelle E. Goodrich

"The struggle ends when gratitude begins."
-- Neale Donald Walsh

"If the only prayer you said was 'Thank You', that would be enough."
-- Meister Eckhart

"Gratitude is our ability to see the grace of God, morning by morning, no matter what else greets us in the course of the day."
-- Craig Barnes

"Gratitude exclaims, very properly, 'How good of God to give me this.'"
-- C.S. Lewis

"Gratitude can transform common days into thanksgivings, turn routine jobs into joy, and change ordinary opportunities into blessings."
-- William Arthur Ward

"Everything we do should be a result of our gratitude for what God has done for us."
-- Lauryn Hill

"To speak gratitude is courteous and pleasant, to enact gratitude is generous and noble, but to live gratitude is to touch Heaven."
-- Johannes A. Gaertner

"Never let a day pass without looking for the good, feeling the good within you, praising, appreciating, blessing, and being grateful.  Make it your life commitment, and you will stand in utter awe of what happens in your life."
-- Rhonda Byrne

"Gratitude is a matter of obedience.  Gratitude draws us close.  Gratitude is a sure path to peace."
-- Nancy Leigh DeMoss

The following are all quotes from Ann Voskamp, "One Thousand Gifts: A Dare to Live Fully Right Where You Are":

"A life contemplating the blessings of Christ becomes a life acting the love of Christ."

"Gratitude for the seemingly insignificant -- a seed -- this plants the giant miracle."

"Gratitude's not a natural posture.  The prince of darkness is ultimately a spoiled ingrate, and I've spent most of my life as kin to the fist-shaker."

"I think the fall in Eden was ultimately a failure to give thanks."

"Giving thanks is that: making the canyon of pain into a megaphone to proclaim the ultimate goodness of God when Satan and all the world would sneer at us to recant."

"Counting one thousand gifts, I discovered I could count on God."