大自然是最好的老师；它已经做了实验，我们只需要解读它们。

今天在可持续性方面的小步骤可能带来明天的巨大变化。

A book should feel like a friend to a child—comforting, exciting, and full of surprises.

Of all the means which wisdom acquires to ensure happiness throughout the whole of life, by far the most important is friendship.