No one feels himself easy in a garden which does not look like the open country.

Who never ate his bread in sorrow, Who never spent the darksome hours Weeping, and watching for the morrow,- He knows you not, ye heavenly Powers.

Experiments are mediators between nature and idea.

What is fruitful alone is true.

Thus I reel from desire to fulfillment and in fulfillment languish for desire.

I will say with Lorenzo de Medici that those who do not hope for another life are always dead to this one.

Nature is beneficent. I praise her and all her works. She is silent and wise. She is cunning, but for good ends. She has brought me here and will also lead me away. She may scold me, but she will not hate her work. I trust her.