Don't stop to ask whether the animal or plant you meet deserves your sympathy, or how much it feels, or even whether it can feel at all: respect it and consider all life sacred.

Whatever you have received more than others-in health, in talents, in ability, in success, in a pleasant childhood, in harmonious conditions of home life-all this you must not take to yourself as a matter of course. In gratitude for your good fortune, you must remember in return some sacrifice of your own life for another life.

We are united with all life that is in nature. Man can no longer live his life for himself alone.

Any profound view of the world is mysticism. It has, of course, to deal with life and the world, both of which are nonrational entities.

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.

Preservation of life is the only true joy.

It is not enough to merely exist. It's not enough to say, 'I'm earning enough to live and support my family. I do my work well. I'm a good parent.' That's all very well. But you must do something more.