种一棵树最好的时间是20年前，第二好的时间是现在。
The best time to plant a tree was 20 years ago; the second best time is now.
The love for all living creatures is the most noble attribute of man.
The degree of slowness is directly proportional to the intensity of memory; the degree of speed is directly proportional to the intensity of forgetting.
时间是一个从我们感知变化的方式中衍生出来的概念。