Closest book. Page 123. Sentences 5, 6, and 7:
There is nothing innovative in the form here, Beethoven apparently content to suggest that a return to routine can bring sufficient rewards for his purposes, as it may symbolize that a return to health can make one appreciate the simple things in life. Here the mood is joyous throughout and full of color and sunshine. The composer clearly conveys that the crisis is behind him, that the music does not celebrate triumph here, but rather expresses joy and thankfulness.
Robert Cummings in All Music Guide to Classical Music.
The second closest book ("American Composers on American Music") resulted in a section by Henry Cowell on how modernists like Charles Seeger are also interested in very old music. The third book relates Henry Cowell finally feeling comfortable enough in his letters to use "Dear Charlie" (and "Love, Henry") rather than the formal "Dear Mr. Ives." But the first quote will be true soon enough so let's go with that one.