Good Morning quotes

Attributed to Winston Churchill in The Prodigal Project : Book I : Genesis (2003) by Ken Abraham and Daniel Hart, p. 224 and other places, though no source attribution is given. It actually derives from an advertising campaign for Budweiser beer in the late 1930s.
Misattributed
Variant: Success is not final, failure is not fatal: it is the courage to continue that counts.
Source: http://quoteinvestigator.com/2013/09/03/success-final/

As quoted in Perfectionism : What's Bad About Being Too Good? (1987) by Miriam Adderholdt and Jan Goldberg, p. 85

This quote is often misattributed to Lincoln. The earliest instance that Quote Investigator could locate was "in an advertisement in 1947 for a book about aging by Edward J. Stieglitz, M.D". The advertisement for “The Second Forty Years” which ran in the Chicago Tribune newspaper read like this: The important thing to you is not how many years in your life, but how much life in your years! (Compare 1947 March 16, Chicago Tribune, “How Long Do You Plan to Live?”, [Advertisement for the book "The Second Forty Years" by Edward J. Stieglitz, M.D.], p. C7, Chicago, Illinois. (ProQuest)). Source of misattribution: It’s Not the Years in Your Life That Count. It’s the Life in Your Years - Abraham Lincoln? Adlai Stevenson? Edward J. Stieglitz? Anonymous? by Quote Investigator on July 14, 2012 http://quoteinvestigator.com/2012/07/14/life-years-count/
To my way of thinking it is not the years in your life but the life in your years that count in the long run.
Adlai Stevenson II, Address at Princeton University, "The Educated Citizen" (22 March 1954) http://infoshare1.princeton.edu/libraries/firestone/rbsc/mudd/online_ex/stevenson/adlai1954.html. This has also been paraphrased "What matters most is not the years in your life, but the life in your years" and misattributed to Abraham Lincoln and Mae West.
Adlai Stevenson II, "If I Were Twenty-One" in Coronet (December 1955).
Misattributed
Variant: It is not the years in your life but the life in your years that counts.

Source: The Notebook

Source: Revolution for the Hell of It (1968), p. 184.

Variant: The happiness of your life depends upon the quality of your thoughts.
Source: Meditations

Source: The Star Wars Trilogy

Source: The Notebook

Source: The Witch of Portobello (2007), p. 152.
Context: You are what you believe yourself to be.
Don't be like those people who believe in "positive thinking" and tell themselves that they're loved and strong and capable. You don't need to do that because you know it already. And when you doubt it — which happens, I think, quite often at this stage of evolution — do as I suggested. Instead of trying to prove that you're better than you think, just laugh. Laugh at your worries and insecurities. View your anxieties with humor. It will be difficult at first, but you'll gradually get used to it. Now go back and meet all those people who think you know everything. Convince yourself that they're right, because we all know everything, it's merely a question of believing.
Believe.

Tallulah: My Autobiography (1952)

2005-09, Address at Stanford University (2005)
Context: When I was 17, I read a quote that went something like: "If you live each day as if it was your last, someday you'll most certainly be right." It made an impression on me, and since then, for the past 33 years, I have looked in the mirror every morning and asked myself: "If today were the last day of my life, would I want to do what I am about to do today?" And whenever the answer has been "No" for too many days in a row, I know I need to change something.

Source: 1790s, The Marriage of Heaven and Hell (1790–1793), Proverbs of Hell, Line 41

Source: Wild: From Lost to Found on the Pacific Crest Trail

Source: Second Glance

Source: Thief of Time

Source: To the Lighthouse

April 20, 1840
Journals (1838-1859)
Source: https://www.walden.org/wp-content/uploads/2016/02/Chapter4.pdf#page=13

Variant: When you arise in the morning, think of what a precious privilege it is to be alive-to breathe, to think, to enjoy, to love.
Source: Meditations

Source: Beatles Lyrics

Source: An Ideal Husband

Works and Days
1870s, Society and Solitude (1870)

Source: Heart of the Sea

Variant: Even if you are on the right track, you will get run over if you just sit there.

Source: Born of Shadows

Source: Is Everyone Hanging Out Without Me?

Variant: Go so far as you can see and when you get there you will always be able to see farther.
Source: See You at the Top (2000), p. 164; Variant: When obstacles arise, you change your direction to reach your goal; you do not change your decision to get there.
Context: Go so far as you can see and when you get there you will always be able to see farther. … as you head toward your goals, be prepared to make some slight adjustments to your course. You don't change your decision to go — you do change your direction to get there.

Source: The Long Song

Source: If You Could See Me Now

Widely attributed to Chaplin and a few others, research done for "A Day Without Laughter is a Day Wasted" at Quote Investigator http://quoteinvestigator.com/2011/07/16/laughter-day/ indicate that such expressions date back to that of Nicolas Chamfort, published in "Historique, Politique et Litteraire, Maximes détachées extraites des manuscrits de Champfort" Mercure Français (18 July 1795), p. 351 http://books.google.com/books?id=N3tBAAAAcAAJ&q=%22pas+ri%22#v=snippet&q=%22pas%20ri%22&f=false: La plus perdue de toutes les journées est celle où l’on n’a pas ri. Translations of this into English have been found as early as one in "Laughing" in Flowers of Literature (1803) by F. Prevost and F. Blagdon :
: I admire the man who exclaimed, “I have lost a day!” because he had neglected to do any good in the course of it; but another has observed that “the most lost of all days, is that in which we have not laughed;” and, I must confess, that I feel myself greatly of his opinion.
Misattributed

ἐν ὀλιγίστοις κεῖται τὸ εὐδαιμόνως βιῶσαι
VII, 67
Source: Meditations (c. 121–180 AD), Book VII

Source: Meditations

Variant: Our greatest glory consists not in never falling, but in rising every time we fall.
Source: The Citizen of the World, Or, Letters from a Chinese Philosopher, Residing in London, to His Friends in the Country, by Dr. Goldsmith

Source: Meditations

Source: Walden (1854), p.375

Oh, the Places You'll Go! (1990)
Source: Oh, The Places You'll Go!

Source: Red Bird

Aeneid (29–19 BC), Book V

Source: Your Best Life Now: 7 Steps to Living at Your Full Potential

Source: Walden

Sleeping with Strangers

Variant: Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

Source: Minima Moralia: Reflections from a Damaged Life

Variant: There is no one alive who
is Youer than You!
Source: Happy Birthday to You!

Source: The Crossing

Illusions : The Adventures of a Reluctant Messiah (1977)

Source: The Picture of Dorian Gray

Source: Post Office

Source: Translations, The Aeneid of Virgil (1866), Book V, p. 153

Ibid.
The Book of Disquiet
Original: Isso não é o meu amor; é apenas a sua vida.

#102
1900s, Maxims for Revolutionists (1903)

Canzone 105, st. 2
Il Canzoniere (c. 1351–1353), To Laura in Life

Attributed quotes

II-II, q. 26, art. 6
Summa Theologica (1265–1274)

A Birthday, st. 2.

1990s, Long Walk to Freedom (1995)

Walking the Path of Compassion (2015)

Act I.
La Celestina (1499)