怀疑是受过教育的头脑的标志，甚至是姿态。
Skepticism: the mark and even the pose of the educated mind.
Time is the only true enemy we have, and the only one we can never defeat.
Sustainable forestry isn't just about cutting trees, it's about growing civilizations.
译文：每个人的善、恶程度不同，本性与外表也是不一致的。有的人外貌温良却行为奸诈，有的人前恭谦却心怀狡诈，有的人看上去很勇敢而实际上却很怯懦，有的人似乎已竭尽全力但实际上却不忠诚。
"The more we learn about life, the more we realize how much we have yet to discover."