The character of the Gray Man is wise, kind, and all-knowing. What was the author's intent in portraying him in this way?

Originally described as “a stranger” with a pale complexion, the gray man is initially believed to have an unusual past, and possibly a “fugitive from justice.” His good deeds and helpful ways see him accepted in to the community, but many are suspicious and wary of him, as he seems “supernatural.” The gray man leaves the community but is seen later, on the battlefield. He is believed by the farm boy who last sees him to be “unsmiling Death.”