The greatest threat to our forests isn’t logging—it’s indifference.

The poet's mission is to illuminate the darkness.

I'm not a person who gives up on my strength.

The property which every man has in his own labor， as it is the original foundation of all other property， so it is the most sacred and inviolable.

数学的本质在于它的自由。

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.