Times Quotes - page 100
Colours no longer looked as brilliant to me as they use to do [Monet's sight was beginning to fail], I no longer painted shades of light so correctly. Reds looked muddy to me, pinks insipid, and the intermediate or lower notes in the colour scale escaped me. As for forms, I could see them as clear as ever, and render them as decisively. At first I tried pertinacity. How many times I have remained for hours near the little bridge, exactly were we are now, in the full glare of the sun, sitting on my camp-stool, under my sunshade, forcing myself to resume my interrupted task and to recapture the freshness my palette had lost! A waste of effort. What I painted was more and more mellow.... and (when) I compared it with what I used to do in the old days. I would fall into a frantic rage, and I slashed all my pictures with my penknife.
Claude Monet