Authors:

That's the terrible thing: the more one works on a picture, the more impossible it becomes to finish it.

Paul Cézanne, Alberto Giacometti, Felix Andreas Baumann, Poul Erik Tøjner, Tobia Bezzola (2008). “Cézanne & Giacometti: paths of doubt”, Hatje Cantz Pub
That's the terrible thing: the more one works on a picture, the more impossible it becomes to finish it.