How did I not know about this thread?
Here are some things that are related to what's on my mind:
I liked those!
"It is not length of life, but depth of life." ~ Ralph Waldo Emerson
"Thought breeds thought." ~ Henry David Thoreau
To avoid criticism, do nothing, say nothing, be nothing.
~ Elbert Hubbard
Music provides one of the clearest examples of a much deeper relation between mathematics and human experience.