"The African is my brother—but he is my younger brother by several centuries."

"Constant kindness can accomplish much. As the sun makes ice melt, kindness causes misunderstanding, mistrust, and hostility to evaporate."

"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."

"The greatest good is that which is done for the greatest number."

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