实现明天理想的唯一障碍是今天的疑虑。
If there's a book that you want to read, but it hasn't been written yet, then you must write it.
The desire for recognition, the thymotic part of the soul, cannot be satisfied by economic activity alone.
可持续发展不仅仅是一种趋势,更是我们对后代的责任。#