According to Spurling after several operations in 1942, when he almost died, he spent the last twelve years of his life with a colostomy. However, during that period he created some of his most colorful and joyous artworks.
I have started reading the Pierre Schneider Matisse book. Many illustrations and excellent text.
Here are some Matisse quotes from the Schneider book:
"Retain only what cannot be seen."
"That which can be learned is not worth teaching."
"He who wants to dedicate himself to painting should start by cutting out his tongue."
"Like all artists who have taken the trouble to use their minds, I am acquainted with all the known theories, but, as far as I am concerned, I have no theory when I am working."