可持续性不仅仅是植树；它是为了正确的理由在正确的地方种植正确的树木。
Sustainability isn't just about planting trees; it's about planting the right trees in the right places for the right reasons.
大自然造就了人们在身体和心智的才能上如此相等，以至于尽管有时候可能会有一个人明显在身体上更强壮，或者在思维上更敏捷，但总结一切，人与人之间的差异并不是如此重大，以至于一个人可以因此而主张自己有权享受任何另一个人也可以同样主张的权益。
保持耐心，耐心等待机会。
Freedom does not consist in any dreamt-of independence from natural laws, but in the knowledge of these laws, and in the possibility this gives of systematically making them work towards definite ends.
数学中最深刻的洞见往往来自意想不到的类比。