The wise does at once what the fool does at last.
Know or listen to those who know.
Well done is better than well said.
It's always too early to quit.
To be a good loser is to learn how to win.
Do not weep do not wax indignant. Understand.
If you think you can do it, you can.
To know oneself, one should assert oneself.
Always desire to learn something useful.
Be gentle to all and stern with yourself.
You can be in Tokyo or Alberta at four in the morning in your hotel and you can still practice if you feel like it. A trombone cannot do that at four in the morning.