It's so much darker when a light goes out than it would have been if it had never shone.

森林的真正价值不仅在于木材产量，还在于生物多样性和生态系统健康。

"The truth is, we all carry our prisons within us."

人的心胸欲念多则狭窄，欲念少则心胸宽广；人的心境多欲则忙乱，少欲则悠闲；人的心术多欲则险恶，少欲则和平；人的心事多欲则忧愁，少欲则快乐；人心之气象，多欲则软弱，少欲则刚强。

The art of doing mathematics consists in finding that special case which contains all the germs of generality.

Setting goals is the first step in turning the invisible into the visible.

"Memory is not a faithful record; it is an active reconstruction of the past."