The first movement is pretty much the best example of my model for composing, not even so much harmonically and melodically, but in the way Mozart builds the piece. It is built around my idea of "organic development". Each melodic phrase in a section is developed from the previous one in some way, but no repetition is the same; this creates a very strong impression of unity and direction upon the listener while ensuring the music doesn't become boring. To me it also has the feel of a through-composed piece (that the composer sat down one day and just wrote out intuitively, without stopping). I like that.
One of my favorite JS Bach organ pieces, especially for this time of year (I played this at church last Sunday, though not nearly as well):
Hope is the denial of reality. It is the carrot dangled before the draft horse to keep him plodding along in a vain attempt to reach it. We should remove the carrot and walk forward with our eyes open. -- Raistlin Majere