Quotes for anniversaries and events

Variant: Love all, trust a few.
Source: All's Well That Ends Well

As quoted in Path for Greatness : Spiritualty at Work (2000) by Linda J. Ferguson, p. 51

This is a paraphrase of an idea that Dewey expressed using other words in My Pedagogic Creed (1897) and Democracy and Education (1916); it is widely misattributed to Dewey as a quotation.
Cf. James William Norman, A Comparison of Tendencies in Secondary Education in England and the United States (New York: Teachers College, Columbia University, 1922), [//books.google.com/books?id=qrmgAAAAMAAJ&pg=PA140 p. 140] (emphasis added): "...there has for years been a strong and growing tendency in the United States under the leadership of Dewey, and more recently of Kilpatrick, to find an educational method correlative of democracy in society with the belief that education is life itself rather than a mere preparation for life, and that practice in democratic living is the best preparation for democracy."
Misattributed
Variant: Education is a social process; education is growth; education is not preparation for life but is life itself.

Source: The Picture of Dorian Gray

Georges Duhamel in THE HEART'S DOMAIN (1919). As it was composed in French, the wording in English may vary in translation. Theodore Geisel / Dr. Seuss was born in 1904, and would have been about 15 years old at the time that it was published. The full text can be found at the link below: We do not know the true value of our moments until they have undergone the test of memory. Like the images the photographer plunges into a golden bath, our sentiments take on color; and only then, after that recoil and that trans-figuration, do we understand their real meaning and enjoy them in all their tranquil splendor.
Misattributed

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: Me: Stories of My Life

Worstward Ho (1983)
Variant: Ever tried. Ever failed. No matter. Try again. Fail again. Fail better.
Context: All of old. Nothing else ever. Ever tried. Ever failed. No matter. Try again. Fail again. Fail better.

As quoted by LIFE magazine (2 May 1955)
1950s
Variant: Strive not to be a success, but rather to be of value.

Narcissus and Goldmund (1930)