Nature is the best guide, and he that follows her, though he may sometimes go astray, yet will he be in the right way in the main.
自然是最好的向导,追随她的人,虽然有时可能会迷路,但总体上会走在正确的道路上。
赏赐并不能让人欢喜,责罚也不能让人畏惧。 
可持续发展不是一种选择,而是现代经济中生存的必要条件。
"It's important to write about difficult subjects in a way that children can understand."
Profit and purpose are not opposites; they must go hand in hand.