Alfred Biese,
The Development of the Feeling for Nature in the Middle Ages and Modern Times
“ It is not only what he says of the private life and special taste of his adored friend which is noteworthy, but the way in which he does it--the tone in which, as a cultivated man of the day, he judged him. 'He will paint and paint Nature. For this he must be acquainted with her. This is why he loves her so well. This is why he strays by the brook and weeps. This is why in spring he goes out into the fields of blossoms, and his eyes run over with tears. All creation fills him with yearning and delight. He goes from mountain to valley like a man in a dream. ”
