如果你不能保持灵活的思路，就会抓狂，忽视解决问题的其他可能性。
If you're not stubborn, you'll give up on experiments too soon. And if you're not flexible, you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.
The best way to predict the future is to create it.
The true measure of success in forestry is leaving the land healthier than we found it.
