The quest for the grail is not archeology, it's a race against ...
Henry Jones: The quest for the grail is not archeology, it's a race against evil. If it is captured by the Nazis the armies of darkness will march all over the face of the earth. Do you understand me?
Indiana Jones: This is an obsession, Dad. I've never understood it. Never. Neither did Mom.
Henry Jones: Oh yes she did. Only too well. Unfortunately, she kept her illness from me. All I could do was mourn her.