Affirmation of the world, which means affirmation of the will-to-live that manifests itself around me, is only possible if I devote myself to other life.

The quiet conscience is an invention of the devil.

The true worth of a man is not to be found in man himself, but in the colours and textures that come alive in others.

We cannot abdicate our conscience to an organization, nor to a government. 'Am I my brother's keeper?' Most certainly I am! I cannot escape my responsibility by saying the State will do all that is necessary. It is a tragedy that nowadays so many think and feel otherwise.

We need a boundless ethic, one which will include the animals, too. Until we extend the circle of his compassions to all living things, we will not find peace.

The city of truth cannot be built on the swampy ground of skepticism.

The deeper we look into nature, the more we recognize that it is full of life, and the more profoundly we know that all life is a secret and that we are united with all life that is in nature.