To endure is the first thing that a child ought to learn, and that which he will have the most need to know.

Jean Jacques Rousseau
Profession: Philosopher
Nationality: Swiss
Some suggestions for you :
Gratitude is a duty which ought to be paid, but which none have a right to expect.
How many famous and high-spirited heroes have lived a day too long?
Virtue is a state of war, and to live in it we have always to combat with ourselves.
Remorse sleeps during prosperity but awakes bitter consciousness during adversity.
All of my misfortunes come from having thought too well of my fellows.
Happiness: a good bank account, a good cook, and a good digestion.
I would rather be a man of paradoxes than a man of prejudices.
We should not teach children the sciences; but give them a taste for them.