To know oneself, one should assert oneself.
Things do not happen. Things are made to happen.
Be gentle to all and stern with yourself.
Wherever you are - be all there.
The wise does at once what the fool does at last.
What you do today can improve all your tomorrows.
The secret of getting ahead is getting started.
Who seeks shall find.
It's always too early to quit.
If you're going through hell, keep going.
A wisely chosen illustration is almost essential to fasten the truth upon the ordinary mind, and no teacher can afford to neglect this part of his preparation.