First of all, "the friendship between gentlemen is indifferent" is an ideal realm of making friends, which encourages people to work hard in this aspect in making friends. Although it can't reach that realm, it will eventually make friendship more pure; It's like not being able to enter the garden; By trying to get close to the garden, you can smell the fragrance of fish flowers and see the bright branches outside the wall, which can cultivate and delight your body and mind to a certain extent, which is much better than using each other by hook or by crook in pursuit of fame and fortune.
Secondly, "a friendship between gentlemen is as light as water" can also guide people to pay attention to the degree of mutual relationship in their friends. If this degree is not appropriate, it will become a rope to kill friendship. "A friendship between gentlemen is as light as water" is relative to a friendship between villains. The distance between friends is appropriate, but the heart is very close. Between villains, say what friends want to hear and do what friends want to do.
Keeping a proper distance between friends is also in line with the routine of life. Keep a proper distance between cars on the road, otherwise they will collide; Friends who stay together all day will inevitably have contradictions and frictions, which will hurt friendship.