当我们为后代规划时，我们应该记住，美德并不是世代相传的。
没有森林，文明将会消亡。
能源的未来在于平衡传统资源和可再生替代品。
The best way to be happy is to live in the present.
History is always written by the victors, but the truth often lies in the silence of the defeated.
The best teacher is the one who suggests rather than dogmatizes, and inspires his listener with the wish to teach himself.
Sun don't shine forever, but as long as it's here then we might as well shine together.