young Lautrec comments his own paintings of the landscape, when he was c. 15 years old. 
Source: 1879-1884, T-Lautrec, by Henri Perruchot, p. 46 - remark to his friend Etienne Devismes - in Nice, 1879
                                    
“It is not possible to find a landscape, which if painted precisely as it is, will not make an impressive picture. No one knows, till he has tried, what strange beauty and subtle composition is prepared to his hand by Nature.”
            Volume III, part V, chapter II (1856). 
Modern Painters (1843-1860)
        
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John Ruskin 133
English writer and art critic 1819–1900Related quotes
                                        
                                        translation from original Dutch: Fons Heijnsbroek 
(original Dutch: citaat van Willem Roelofs, in het Nederlands:) Ik geloof beslist dat de natuur die het meest geschikt is om na te schilderen, het eenvoudige landschap is dat weinig indrukwekkend lijkt. 
as cited in  Zó Hollands - Het Hollandse landschap in de Nederlandse kunst sinds 1850, Antoon Erftemeijer https://www.franshalsmuseum.nl/wp-content/uploads/2017/12/zohollands_eindversie_def_1.pdf; Frans Hals museum | De Hallen, Haarlem 2011, p. 16 – note 2 
undated quotes
                                    
“No one knows what he can do till he tries.”
                                        
                                        Maxim 786 
Sentences, The Moral Sayings of Publius Syrus, a Roman Slave
                                    
                                        
                                        Quote from 'The History of Landscape Painting,' fourth lecture, Royal Institution (16 June 1836), from John Constable's Discourses, ed. R.B. Beckett, (Ipswich, Suffolk Records Society, 1970), p. 69. 
1830s, his lectures History of Landscape Painting (1836)
                                    
                                        
                                        Kenneth Noland, p. 9 
Conversation with Karen Wilkin' (1986-1988)
                                    
                                        
                                        (original Dutch: citaat van Willem Roelofs, in het Nederlands:) Ik geloof beslist dat de natuur die het meest geschikt is om na te schilderen, het eenvoudige landschap is dat weinig indrukwekkend lijkt.
as cited in  Zó Hollands - Het Hollandse landschap in de Nederlandse kunst sinds 1850, Antoon Erftemeijer https://www.franshalsmuseum.nl/wp-content/uploads/2017/12/zohollands_eindversie_def_1.pdf; Frans Hals museum | De Hallen, Haarlem 2011, p. 16 – note 2 
undated quotes
                                    
                                        
                                        as quoted in Per Kirkeby: Paintings and Drawings, Helaine Posner, exhibition catalogue (Cambridge, Massachusetts: MIT List Visual Arts Center, 1992 
1965 - 1995
                                    
1911 - 1940, Notes on Painting - Edward Hopper (1933)