Despite his joy in Wolff as someone who in his own fashion had arrived at certain truths which he himself had also discovered, and despite his agreement with Wolff's phenomenalistic principle, Goethe could in no way accept his explanation of why metamorphosis took place in plants. He said: 'In plant metamorphosis Wolff saw how the same organ continuously draws together, makes itself smaller; he did not see that this contraction alternates with an expansion. He saw that the organ diminishes in volume, but not that at the same time it ennobles itself, and so, against reason, he attributed decline to the path towards perfection.' What was it, then, which had prevented Wolff from seeing things aright? 'However admirable may be Wolff's method, through which he has achieved so much, the excellent man never thought that there may be a difference between seeing and seeing, that the eyes of the spirit have to work in perpetual living connection with those of the body, for one otherwise risks seeing and yet seeing past a thing (zu sehen und doch vorbeizusehen).'