The credit of advancing science has always been due to individuals and never to the age.

No one would talk much in society if they knew how often they misunderstood others.

One can be instructed in society, one is inspired only in solitude.

Where is the man who has the strength to be true, and to show himself as he is?

Only by joy and sorrow does a person know anything about themselves and their destiny. They learn what to do and what to avoid.