Both incentives and punishments elicit powerful responses.

"The world is full of obvious things which nobody by any chance ever observes."

The great powers are always searching for opportunities to gain power at the expense of their rivals, and they will use force if they believe it will bring them strategic advantage.

我们不是从祖先那里继承地球；我们是从子孙那里借来的——这在林业中尤其如此。