Book Review 1-1

I read this book, "King Arthur", because I like fiction.
The stories of "King Arthur"are very old so that story have various style, for example, Old England, French, and so on.

I know the sword, Excalibur. Only King Arthur used this sword because he can put the sword back into the stone. All the knight tried to take it out, but the sword didn't move.

I impressed Chapter 6 "The Grail". Sir Galahad, the knights of King Arthur, had seen the Grail and he said that he was happy when he died. Then, an old man came and said to him that his work was done and God calls him!
Why Sir Galahad said like that?
I think it is the background of Christianity. Man live to fulfill the mission imposed on him or her from a point of view of Christianity.