Ever since the age of six I have had a mania for drawing the forms of objects. Towards the age of fifty I published a very large number of drawings, but I am dissatisfied with everything I produced before the age of seventy. It was at the age of seventy-three I nearly mastered the real nature and form of birds, fish, plants, etceteras.
Consequently, at the age of eighty, I shall have got to the bottom of things; at one hundred I shall have attained a decidedly higher level which I cannot define, and at the age of one hundred and ten every dot and every line from my brush will be alive. I call on those who may live as long as I to see if I keep my word.