There is an old Chinese proverb: “A unit of time is as precious as a unit of gold, but you cannot buy back one unit of time with one unit of gold.” It means that time is really very precious, as no amount of money can buy time.
 
[20] In ancient China, when a male wore a hat, it meant he had passed the age of becoming an adult.
 
[21] In ancient China, in place of buttons, people used hooks. When dressed, hooks had to be tied.
 
[22] In ancient China, people paid their respect to other people by bowing, holding one hand over the other which is closed, or prostrating on the ground.
 
[23] In ancient China, curtains were made of bamboo strips woven together. They were used to shelter a room from view.
 
[24] Even though a container may be empty, out of reverence to things, whether living or not, one should treat it with respect and handle it with care.
 
[25] In ancient China, a virtuous man always behaved properly, regardless of whether he was alone or with others.
 
[26] If you do not understand part of book you are reading, read it again and again, even for a thousand times. Its meaning will come to you naturally.
 
[27] “Brush” here means a Chinese writing brush.