A prolific and engaging writer, Einstein in his long career corresponded with notables and ordinary people alike. At times he touched on matters of great moment, at other times on everyday things, like advising a young person on a career choice. In a small centennial volume, Albert Einstein, The Human Side (Princeton University Press, $8.95), his onetime collaborator Banesh Hoffmann and his former secretary Helen Dukas have mined some nuggets from his letters in the master's archives at Princeton. A sampler:
On his world renown: With fame I become more and more stupid, which, of course, is a very common phenomenon. There...