"It is not enough to be good; you must be good for something."

"The first step in the evolution of ethics is a sense of solidarity with other human beings."

"A man is ethical only when life, as such, is sacred to him."

"The greatest good you can do for another is not just to share your riches but to reveal to him his own."

"The greatest challenge of the day is: how to bring about a revolution of the heart, a revolution which has to start with each one of us."