Never complain and never explain.
Always desire to learn something useful.
It's always too early to quit.
Be kind whenever possible. It is always possible.
Be gentle to all and stern with yourself.
Well done is better than well said.
Problems are not stop signs, they are guidelines.
Without hard work, nothing grows but weeds.
You never know what motivates you.
By failing to prepare, you are preparing to fail.
Everyone will tell you how rigid I am, but a teacher has to be flexible. You can't cut the student to your cloth you have to cut yourself to theirs.