Based on the context and the answer, generate a question. 

Context: Hope is what human hearts run on . Hope is why human beings keep bringing children into a fallen world . " Ortberg tells the story of French painter Henri Matisse . Near the end of his life , Matisse had severe arthritis in his hands . But he continued to paint , to the point of pain so severe it would bring tears to his eyes .

Answer:

He knew that his paintings uplifted others .



Why did Matisse continue painting even though it caused him pain ?