We must never allow the voice of humanity within us to be silenced. It is humanity's sympathy with all creatures that first makes us truly human.

As we acquire knowledge, things do not become more comprehensible, but more mysterious.

The witch doctor succeeds for the same reason all the rest of us succeed. Each patient carries his or her own doctor inside him or her. They come to us not knowing that truth. We are at our best when we give the doctor who resides within each patient a chance to go to work.

Not only is example the best way to teach, it is the only way.

Our degeneration, when it is traced back to its origin in our view of the world really consists in the fact that true optimism has vanished unperceived from our midst.

Today it is considered as exaggeration to proclaim constant respect for every form of life as being the serious demand of a rational ethic. But the time is coming when people will be amazed that the human race existed so long before it recognized that thoughtless injury to life is incompatible with real ethics. Ethics is in its unqualified form extended responsibility to everything that has life.

Nature compels us to recognize the fact of mutual dependence, each life necessarily helping the other lives who are linked to it. In the very fibers of our being, we bear within ourselves the fact of the solidarity of life.