Courtesy of artblog.net, a blog whose proprietor is also an excellent painter:
“From the age of six I was in the habit of drawing all kinds of things. Although I had produced numerous designs by my fiftieth year, none of my works done before my seventieth is really worth counting. At the age of seventy-three I have come to understand the true form of animals, insects and fish and the nature of plants and trees. Consequently, by the age of eighty-six I will have made more and more progress, and at ninety I will have got closer to the essence of art. At the age of one hundred I will have reached a magnificent level and at one hundred and ten each dot and each line will be alive. I would like to ask those who outlive me to observe that I have not spoken without reason.”
Hokusai, One Hundred Views of Mt. Fuji