The world is my country, all mankind are my brethren, and to do good is my religion.

There are no vital and significant forms of art; there is only art, and precious little of that.

The more often a stupidity is repeated， the more it gets the appearance of wisdom.

We are at a unique stage in our history. Never before have we had such an awareness of what we are doing to the planet, and never before have we had the power to do something about it.

历史是对于未来最好的老师。历史书中的答案价值万金 。