Everybody acts not only under external compulsion but also in accordance with inner necessity.

The most practical solution is a good theory.

I have become an obstinate heretic in the eyes of my colleagues. Momentary success carries more power of conviction than reflections upon principles.

Common sense needs constant reappraisal.

Nothing will benefit human health and increase the chances for survival of life on Earth as much as the evolution to a vegetarian diet.

Any power must be an enemy of mankind which enslaves the individual by power and by force, whether it arises under the Fascist or the Communist flag. All that is valuable in human society depends upon the opportunity for development accorded to the individual.

O, Youth: Do you know that yours is not the first generation to yearn for a life full of beauty and freedom?