Quincy Jones:

Nadia Boulanger used to tell me all the time, “Quincy, your music can never be more or less than you are as a human being.” It’s okay to play fast and all that other stuff, but unless you have a life experience, and have something to say that you’ve lived, you have nothing to contribute at all. So I decided to live my life, and I did.

Source: Nadia Boulanger, the Most Influential Music Teacher of the 20th Century