An old saying about being cautious in making friends,

1. A gentleman's friendship is as light as water, while a villain's friendship is as sweet as a cucumber. -Zhuangzi Samwood

Vernacular translation: A friendship between gentlemen stems from mutual understanding. In this understanding, we are not demanding, compulsive, jealous or clingy. So in the eyes of ordinary people, it is as light as white water.

2. Make friends and score points, and sharpen the rules. -Zhou Xingsi in the Northern and Southern Dynasties

Vernacular translation: To make friends, you should be congenial, learn from each other, and encourage each other in character.

3. Those who pay with money will give it up when it is exhausted; Make friends with color, but love Chongqing —— Vernacular translation of Warring States Policy during the Warring States Period

: Friends made with money, when the money runs out, the friendship will come to an end; Friends made by beauty, when they are old, their feelings will turn sour.

4. Those who aspire to the Tao have fewer friends, while those who pursue profits have more. -Wang Fu of the Han Dynasty

Vernacular translation: Few friends aspire to the right path, but those who strive for fame and gain have many companions with the same taste.

5. There are three friends who benefit and three friends who lose. Friends are straightforward, friends forgive, and friends hear more, which is beneficial. Friends are easy to break, friendly and soft, and friends are easy to lose. -The Analects of Confucius in the Spring and Autumn Period

Vernacular translation: There are three kinds of beneficial friends and three kinds of harmful friends. It is beneficial to make honest friends, honest friends and knowledgeable friends. It is harmful to make friends with flatterers, people who flatter but slander others behind their backs, and people who are good at rhetoric. Choosing a friend is a science. Stay away from bad friends and walk with good friends, and your life will be more exciting.

6, the horse power is known from a distance, and people will see it for a long time. -"Shi Lin Guang Ji" Song Chen Yuanliang

Vernacular translation: It takes a long way to know the strength of a horse, and it takes a long time to see the quality of a person's heart. Metaphor after a long test to see the quality of people's hearts, true and false friendship.