Bach's music is revealing. While listening to the Musical Offering I can say that his music allows me to travel around different places, which are not only filled with enjoyment but also with desire. That's the magic that Bach gives to us: it is absolutely great, but it makes you want to create something on your own.
Thus, a masterpiece can be described as a marvelous but humble work. The best thing to listen, but still a great path to new works. Maybe beauty is always present when something is great but also tells you that nothing is totally achieved. Desire can breath in such a work.