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

One must be a god to be able to tell successes from failures without making a mistake.

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!

There is nothing more awful, insulting, and depressing than banality.

Medicine is my lawful wife and literature my mistress; when I get tired of one, I spend the night with the other.

Life is given only once, and one wants to live it boldly, with full conscious and beauty.

If you cry 'forward', you must without fail make plain in what direction to go.