We must be young to do great things.

Only the heart without a stain knows ease.

He who does not see the whole world in his friends, does not deserve that the world should hear of him.

Taste is only to be educated by contemplation, not of the tolerably good but of the truly excellent.

And step by step, along the path of life, There's nothing true but Heaven.

Nature! We are enveloped and embraced by her, incapable of emerging from her and incapable of entering her more deeply. Unbidden and unwarned, she receives us into the circuits of her dance, drifting onward with us herself, until we grow tired and drop from her arms.

The most damaging prejudice consists of banning any kind of investigation of nature.