We separate color and drawing because we have to. But nature doesn't. She doesn't give something a shape, for coloring it only afterwards. Form and c… - Willem Roelofs

(original Dutch: citaat van Willem Roelofs, in het Nederlands:) ..elken dag die ik bij den heer B [zijn leermeester ] kan profiteren is alweder gewonnen.. ..van dag tot dag wordt mijn ambitie grooter.

Ships, houses, mills... in one word everything that is made by people must stand upright and be painted with care. This is actually a good presentation compared to other, less symmetrical things, like the trees, skies, etc. It doesn't create the painting, but it certainly strengthen the illusion. It's just like somebody who is neatly dressed, but whose tie is coming off. The windows of a house must be straight, a mill in a pure construction, the blades well-positioned in perspective. (translation from original Dutch: Fons Heijnsbroek)

[a landscape painter cannot do with] being stupid-natural.. ..all that art would be [made] in vain if the feeling stayed away. (translation from original Dutch: Fons Heijnsbroek)