“Facing a landscape annihilated by the light, to remain serene supposes a temper I do not have. The sun is my purveyor of black thoughts; and summer the season when I have always reconsidered my relations with this world and with myself, to the greatest prejudice of both.”

Quote (1908), # 831, in The Diaries of Paul Klee; University of California Press, 1964; as quoted by Francesco Mazzaferro, in 'The Diaries of Paul Klee - Part Three' : Klee as a Secessionist and a Neo-Impressionist Artist http://letteraturaartistica.blogspot.nl/2015/05/paul-klee-ev.html
1903 - 1910

1960s, Why I Am Opposed to the War in Vietnam (1967)
Context: As I have walked among the desperate, rejected, and angry young men, I have told them that Molotov cocktails and rifles would not solve their problems. I have tried to offer them my deepest compassion while maintaining my conviction that social change comes most meaningfully through non-violent action; for they ask and write me, "So what about Vietnam?" They ask if our nation wasn't using massive doses of violence to solve its problems to bring about the changes it wanted. Their questions hit home, and I knew that I could never again raise my voice against the violence of the oppressed in the ghettos without first having spoken clearly to the greatest purveyor of violence in the world today: my own government. For the sake of those boys, for the sake of this government, for the sake of the hundreds of thousands trembling under our violence I cannot be silent.

Quote from Constable's letter to Rev. John Fisher (22 July 1812), as quoted in Richard Friedenthal, Letters of the great artists – from Blake to Pollock (Thames and Hudson, London, 1963), p. 40
1800s - 1810s

Source: Walden

Quoted in Alan Wood Bertrand Russell: The Passionate Skeptic: A Biography, Vol. 2 (1958), p. 233
1950s

Hope for the Troubled Heart: Finding God in the Midst of Pain (1991); the last statement of this anecdote has often become quoted as if it originated with Graham: "My home is in Heaven. I'm just traveling through this world."
Context: In my travels, I have found that those who keep heaven in view remain serene and cheerful in the darkest day. If the glories of Heaven were more real to us, if we lived less for material things and more for things eternal and spiritual, we would be less easily disturbed by this present life.
A friend told me about stopping on a street corner in London and listening to a man play the bagpipes. He was playing "Amazing Grace" and smiling from ear to ear. My friend asked him if he was from Scotland, and he answered, “No sir, my home is in Heaven. I'm just traveling through this world.”

Source: How 'Slam Dunk' Manga artist brings characters to life https://edition.cnn.com/2012/11/29/showbiz/takehiko-inoue-human-to-hero/index.html,CNN

Vão os anos decendo, e já do Estio
Há pouco que passar até o Outono;
A Fortuna me faz o engenho frio,
Do qual já não me jacto nem me abono;
Os desgostos me vão levando ao rio
Do negro esquecimento e eterno sono...
Stanza 9, lines 1–6 (tr. William Julius Mickle)
Epic poetry, Os Lusíadas (1572), Canto X

1947 - 1960
Source: Interview in Dialogues on Art, Edouard Roditi; London, 1960, pp. 91–92