You can't do four movies and be good to everybody and be flying all night and shooting all day with a different wig and then be going to sing on Broadway without feeling a little tired. You endlessly feel you're letting somebody down.
A recently reprinted memoir by Frederick Douglass has footnotes explaining what words like 'arraigned,' 'curried' and 'exculpate' meant, and explaining who Job was. In other words, this man who was born a slave and never went to school educated himself to the point where his words now have to be explained to today's expensively under-educated generation.