After a storm comes a calm.
Only the educated are free.
Without hard work, nothing grows but weeds.
It's always too early to quit.
The secret of getting ahead is getting started.
Be gentle to all and stern with yourself.
Leap, and the net will appear.
Never complain and never explain.
You never know what motivates you.
Well done is better than well said.
The frontiers of knowledge in the various fields of our subject are expanding at such a rate that, work as hard as one can, one finds oneself further and further away from an understanding of the whole.