Daniel Gregory Mason,
The Appreciation of Music - Vol…
“ Just as a novelist develops his characters by letting their fundamental peculiarities manifest themselves in all sorts of ways and among all kinds of circumstances, meanwhile paying but scant attention to their more accidental or superficial traits, so the composer of a sonata seizes upon whatever is individual in his themes—a strong rhythm, a peculiar turn of phrase, a striking bit of harmony—and repeats and insists upon it tirelessly, with whatever variation of minor details his ingenuity may suggest. ”
