We might as well understand these two sentences from the perspective of ethics and morality. It may not mean which kind of friends are desirable and which kind of friends are not necessary at all; or which kind of friendship is noble and which kind is despicable. . The ancient Chinese have long believed that "all men are brothers within the four seas", and modern Western civilization also has the concept of "fraternity", which simply means that everyone should be friends with each other.

However, there are all kinds of people in the world, and there are all kinds of people. It is impossible for everyone to become friends through friendship based on one rule, one standard, and one form. I believe that a person's personality, as well as his experience, status and cultural influence can shape his principles of making friends, and the type of friends he makes also has certain tendencies. However, under normal circumstances, we all have many different types of friends, and we can maintain and develop friendships with them in different ways, achieving equality and mutual benefit in different realms. The ability of people to have this ability is determined by the inherent diversity of people's inner world.

In other words, it is impossible for a person to want only emotions but not interests, only want wisdom but not health, only want happiness but not safety, only want loyalty but not principles, only want fame and fortune but not dignity, only want logic but not morality. Because you have to give if you want to get something, and you have to make different sacrifices if you want to get something different. The two sentences here talk about this truth: spiritual friends have to make spiritual efforts, emotional friends have to make emotional efforts, and material benefits Friends must make material efforts, and must not be arrogant, indiscriminate, or blindly invest.

The friendship between gentlemen is as clear as water without impurities, while the friendship between villains is as sweet as liqueur. Although the friendship between gentlemen is plain, they are close at heart. Although the friendship between villains is too close and sweet, it is easy to break off the relationship (because of interests).

Because gentlemen have noble sentiments, their friendship is as light as water. The word "as light as water" here does not mean that the feelings between gentlemen are as light as water, but that the interactions between gentlemen do not contain any utilitarian intentions. Their interactions are purely friendship, but long-lasting and cordial. The interactions between villains contain a strong sense of utilitarianism. They build their friendship on the basis of mutual use. On the surface, it seems "sweet". If the other party cannot meet their utilitarian needs, it is easy to break off. There are only interests. Therefore, when interacting with others, look for gentlemen, not villains.