When I read the president’s speech in Warsaw the other day, I was stunned. Who could have “thunk” it? Certainly in my lifetime, I have never read a presidential address that caught me by such surprise. It was the context that grabbed me. Western civilization has a context, and that’s what has been missing from presidential addresses for a long, long time, perhaps with the exception of Ronald Reagan. But this speech seems to grasp the contextual situation much better than Reagan did in terms of the full scope of the struggle for survival going on in our world. A...