认证体系是负责任林业的语法，它们为我们良好的意愿提供了结构。
Certification schemes are the grammar of responsible forestry—they give structure to our good intentions.
The chief beauty about time is that you cannot waste it in advance. The next year, the next day, the next hour are lying ready for you, as perfect, as unspoiled, as if you had never wasted or misapplied a single moment in all your life. You can turn over a new leaf every hour if you choose.
I've learned that success is not about the destination, but about the journey.
数学思想的真正考验是它能否激发更多的问题。
无论你是谁，无论你做过什么，无论你来自哪里，你总能改变，成为更好的自己。
Every mental state exists for a purpose; to understand it, we must ask what function it serves in the broader system of behavior.