Sustainability is not an option; it’s a responsibility.

The value or worth of a man is, as of all other things, his price; that is to say, so much as would be given for the use of his power.

Sometimes the simplest ideas are the strongest.

Liberty cannot be preserved without a general knowledge among the people.

世界上充满了自童年以来从未以开放的心态面对开放的门的人。

教育不是注满一桶水，而是点燃一把火。