独裁统治最好的武器是保密，但民主最好的武器应该是开放的武器。
The best weapon of a dictatorship is secrecy, but the best weapon of a democracy should be the weapon of openness.
Fear is just a feeling. Don’t let it stop you.
We begin with the hypothesis that any subject can be taught effectively in some intellectually honest form to any child at any stage of development.
林业技术已从链锯发展到卫星，但我们的责任始终如一。