Because I have confidence in the power of truth, and of the spirit, I have confidence in the future of mankind.

The highest proof of the spirit is love. Love the eternal thing which can already on earth possess as it really is.

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

There slowly grew up in me an unshakable conviction that we have no right to inflict suffering and death on another living creature, unless there is some unavoidable necessity for it.

A good example has twice the value of good advice

Everything deep is also simple and can be reproduced simply as long as its reference to the whole truth is maintained. But what matters is not what is witty but what is true.

A man is ethical only when life, as such, is sacred to him, that of plants and animals as that of his fellow men, and when he devotes himself helpfully to all life that is in need of help.