102 years ago today, June 20, 1923 (May 7, 1923 in the lunar calendar), the great discussion on love came to an end. On June 20, 1923, Dr. Zhang Jingsheng, a doctor of love, hoped to end this discussion on love as soon as possible. He published a public defense article in the "Morning News Supplement""to end the controversy. The reason why he defended in advance was that he was eager to travel to Mongolia and Northeast China and couldn't bear to wait. In the article, Zhang Jingsheng first refuted the view that "love is mysterious and unconditional." He said that love is not a mystery, but that some people regard it as a mystery. Love and conditions cannot be separated. Unconditional means no love. Those who oppose the rule of "love is conditional" admit that "love is a combination of various emotions", which is tantamount to affirming that emotion is the first condition that constitutes love. Can "reputation, appearance, property" be included in the conditions of love? Zhang Jingsheng said that his so-called "reputation" is the general name of achievements, morality, and articles. Of course, it is an indispensable condition for combining a happy and unlacking love. Appearance is also related to love. Beauty is a kind of beauty. If all other conditions are met and the conditions of appearance can be added, love will certainly be more happy. As for property, it is not only related to love, but in a broad sense, it is "the source of life and the beginning of everything." A person with personality can use his property to develop his broadest personality; A person with feelings can use property to expand his infinite feelings; a talented person can use property to enhance his deeper talents. If the person you love has feelings, personality, talents, reputation, appearance and other conditions in addition to wealth, can it be said that he is moved by desire for profit? Do the principles of love comparison and change apply to marriage? Zhang Jingsheng's answer is yes. The so-called comparison and change do not mean that we must find a third party outside of the couple. People who have become a couple understand the rules of love changes and should try their best to make love evolve day by day. This is of great benefit to the people's hearts and changing customs, and is by no means tempting for evil. "Couples are a kind of friends". The friends mentioned in this rule are generally referred to and friends in the broad sense; but couples are not ordinary friends, just like saying that horses are a kind of beasts, but not the same as "cows" who are also beasts. Zhang Jingsheng expressed his disagreement with using a couple's sexual life to prove that a couple is not a kind of friend. He believes that sexual intercourse and love are completely different things, because there is love first, and then there is sexual intercourse. It is not that there is sexual intercourse first, and then there is love. Although they are not a couple, sexual intercourse can also occur; if there are happy conditions, whether there is sexual intercourse or not, love is the same. After Zhang Jingsheng finished his reply, the "Morning News Supplement" published three more relevant letters, and the discussion was terminated this month.