Task: Question Answering
Input (English): 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 . 
Question: Why did Matisse continue painting even though it caused him pain ?
Output (English): He knew that his paintings uplifted others .