To make a vow for life is to make oneself a slave.
Use, do not abuse; neither abstinence nor excess ever renders man happy.
The more you know, the less sure you are.
Hope should no more be a virtue than fear; we fear and we hope, according to what is promised or threatened us.
What a pessimist you are!" exclaimed Candide. "That is because I know what life is," said Martin.
Men are equal; it is not birth but virtue that makes the difference.