This was clearly reflected in a letter that he wrote to his friend Gustave Geffroy in 1908, when he was still occupied with the same theme:
'You must know I'm entirely absorbed in my work. These landscapes of water and reflections have become an obsession. It's quite beyond my powers at my age, and yet I want to succeed in expressing what I feel. I've destroyed some... I start others... and I hope that something will come out of so much effort'.