It's always too early to quit.
Things do not happen. Things are made to happen.
Either you run the day or the day runs you.
If you can dream it, you can do it.
By failing to prepare, you are preparing to fail.
Leap, and the net will appear.
Know or listen to those who know.
Well done is better than well said.
Do not weep do not wax indignant. Understand.
Expect problems and eat them for breakfast.
In regard to music, I just think that it's always best to have an attitude of being a perpetual student and always look to learn something new about music, because there's always something new to learn.