Be thine own palace, or the world's thy jail.
Be gentle to all and stern with yourself.
Know or listen to those who know.
To know oneself, one should assert oneself.
It's always too early to quit.
Only the educated are free.
Never complain and never explain.
If you've got a talent, protect it.
Be kind whenever possible. It is always possible.
I can, therefore I am.
Parents should conduct their arguments in quiet, respectful tones, but in a foreign language. You'd be surprised what an inducement that is to the education of children.
Many people mistakenly think a new technology cancels out an old one.