Appreciation is the ever expanding energy of valuing.
-Arnold Patent
Appreciation begets appreciation 
and something more to appreciate.
-A. S. Vickers
The aim of life is appreciation;
there is no sense in not appreciating things;
and there is no sense in having more of them
if you have less appreciation of them.
-Gilbert K. Chesterton
Truly appreciate life,
and you'll find you have more of it.
-Ralph Marston
I would rather be able to appreciate the things I cannot have
than to have things I am not able to appreciate.
-Elbert Hubbard
Whenever you appreciate a certain thing
you become conscious of its real quality,
and whenever you become conscious of the quality of anything,
you begin to develop that quality in yourself.
-Christian Larson
Appreciate the quality of each thing and person,
as it, he or she is,
without comparisons which qualify the appreciation.
-Nilankantha Sri Ram
The deepest craving of human nature is to be appreciated.
-William James
Gratitude is an emotion that reflects our deep appreciation
for what we value, what brings meaning to our lives
and what makes us feel connected to ourselves and others.
-Brene Brown
Gratitude is a cultivated state.
-Dale Carnegie
Gratitude is a fruit of great cultivation.
-Samuel Johnson
Gratitude is the great attitude.
-Shaun de Warren
Of all the "attitudes" we can acquire,
surely the attitude of gratitude
is the most important and by far the most life-changing.
-Zig Ziglar
Gratitude is not a mere word;
it is not a mere concept.
It is the living breath of your real existence on earth.
-Sri Chinmoy
Words of praise, gratitude or thanksgiving
expand, set free, and in every way radiate energy.
-Charles Fillmore
When it comes to life the critical thing
is whether you take things for granted or take them with gratitude.
-Gilbert K. Chesterton
If you see no reason for giving thanks,
the fault lies in yourself.
-Native American Saying
When your forgiveness is complete
you will have total gratitude.
-A Course in Miracles
Gratitude is one of the least articulate of the emotions,
particularly when it is deep.
-Felix Frankfurter
Feeling gratitude and not expressing it
is like wrapping a present and not giving it.
-William Arthur Ward
Gratitude should not be silent
-The Oculatum
As we express our gratitude,
we must never forget that the highest appreciation
is not to utter words, but to live them.
-John Fitzgerald Kennedy
Thankfulness is the beginning of gratitude.
Gratitude is the completion of thankfulness.
Thankfulness may consist merely of words.
Gratitude is shown in acts.
-Henri Frederic Amiel
One can never pay in gratitude:
one can only pay 'in kind' somewhere else in life.
-Anne Morrow Lindbergh
If you are really thankful, what do you do?
You share.
-W. Clement Stone
You bless the world most powerfully by appreciating it.
-Alan Cohen
An attitude of gratitude creates blessings.
-John Templeton
Gratitude begets itself, ripens into flowers,
snow falls, mountains of more gratitude.
-Geneen Roth
Gratitude is the fairest blossom
which springs from the soul.
-Henry Ward Beecher
Gratitude is the sign of noble souls.
-Aesop
A thankful heart is not only the greatest of virtue,
but also the parent of all other virtues.
-Marcus Tullius Cicero
There is always, always, always 
something to be thankful for.
-Anonymous
I can no other answer make, 
but, thanks, and ever thanks. 
-William Shakespeare
Joy is the simplest form of gratitude.
-Karl Barth
Swift gratitude is the sweetest.
-Greek Proverb
Happiness is itself is a kind of gratitude.
-Joseph Wood Krutch
Gratitude is the heart's memory.
-French Proverb
There shall be
Eternal summer in the grateful heart.
-Celia Thaxter
Give thanks for unknown blessings
already on their way.
-Native American