You must trust and believe in people or life becomes impossible.

A tree is beautiful, but what's more, it has a right to life; like water, the sun and the stars, it is essential. Life on earth is inconceivable without trees. Forests create climate, climate influences peoples' character, and so on and so forth. There can be neither civilization nor happiness if forests crash down under the axe, if the climate is harsh and severe, if people are also harsh and severe. ... What a terrible future!

The happy man only feels at ease because the unhappy bear their burden in silence. Without this silence, happiness would be impossible.

We learn about life not from plusses alone, but from minuses as well.

Only one who loves can remember so well.

I swear fearfully at the conventions of the stage.

One must not put a loaded rifle on the stage if no one is thinking of firing it.