Well done is better than well said.
Never complain and never explain.
It's always too early to quit.
Quality is not an act, it is a habit.
The secret of getting ahead is getting started.
Only the educated are free.
Always desire to learn something useful.
If you think you can do it, you can.
Be kind whenever possible. It is always possible.
Be gentle to all and stern with yourself.
Spend time reflecting on your emotional and physical existence and how that applies to the voice. You have to apply that wisdom and experience when you sing - it's what comes through.