Source: Practical Pictorial Photography, 1898, Composition and clouds considered as an aid to expression, p. 105
“.. Our life is a pilgrim's progress. I once saw a very beautiful picture: it was a landscape at evening. In the distance on the right-hand side a row of hills appeared blue in the evening mist. Above those hills the splendour of the sunset, the grey clouds with their linings of silver and gold and purple. The landscape is a plain or heath covered with grass and its yellow leaves, for it was in autumn. Through the landscape a road leads to a high mountain far, far away, on the top of that mountain is a city wherein the setting sun casts a glory. On the road walks a pilgrim, staff in hand. He has been walking for a good long while already and he is very tired. And now he meets a woman, or figure in black, that makes one think of St. Paul's word: As being sorrowful yet always rejoicing. That Angel of God has been placed there to encourage the pilgrims and to answer their questions and the pilgrim asks her: Does the road go uphill then all the way? And the answer is: "Yes to the very end."”
            Quote of Vincent van Gogh, from  his 'First Sunday Sermon' http://www.vggallery.com/misc/archives/sermon.htm: 'I Am a Stranger on the Earth..'; 29 October 1876 
1870s
        
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Vincent Van Gogh 238
Dutch post-Impressionist painter (1853-1890) 1853–1890Related quotes
                                        
                                        Quote from Friedrich's Diary-note, 1803; as cited by C. D. Eberlein in C. D. Friedrich - Bekenntnisse, pp. 72-73; translated and quoted by Linda Siegel in Caspar David Friedrich and the Age of German Romanticism, Boston Branden Press Publishers, 1978, p. 45 
1794 - 1840
                                    
Source: 1961 - 1975, Barbara Hepworth, A Pictorial autobiography', 1970, p. 280
1970s - 1980s, interview with Deborah Salomon in 'New York Times', 1989
Source: 2000 - 2011, Cy Twombly, 2000', by David Sylvester (June 2000), p. 173
                                        
                                        Diary-note of Boudin, 3 December, 1856; as cited in  the description of his painting 'Sky, Setting Sun, Bushes in Foreground' http://www.muma-lehavre.fr/en/collections/artworks-in-context/eugene-boudin/boudin-skies, by the Muma-museum,  Le Havre 
A quote from Boudin's personal diary sheds remarkable light on a small group of his sky studies 
1850s - 1870s