If you are sincere

The whole class turned to look at the door. Uyên stood there, her expression gentle and warm yet serious, holding a sheet of paper, and said:

• Excuse me, I have a letter to deliver to Long.
  The classmates cried out in surprise. Everyone knew that Long had been courting Uyên for a long time. Long was in his third year, Uyên in her second. Seeing how pitiful Long's one-sided love for Uyên was, the whole class often teased him, but also supported him and gave him chances. As 8 March approached, Long summoned all his courage and sent Uyên a letter with a small gift, a rose petal. Of course he sent it secretly. He never expected that today Uyên would come right to the classroom door and hand over her reply publicly, in front of everybody like this. Long, flustered and blushing, stepped out to take the letter and mumbled his thanks.
  No sooner had Uyên turned away than all 43 of his classmates pounced and snatched the letter. One of them, imitating a sweet woman's voice, read the letter aloud for the whole class to hear:
• Dear Long, First of all I would like to thank you for your 8 March gift, and for the letter full of feeling. I will keep the rose petal on the teachers' table for everyone to admire together. As for the letter, I would like to reply clearly so that you can set your mind at ease to study, and so can I.
  Long, I have witnessed quite a few couples break up, and they all fell in love when they were very young, still sitting in school. I think there are two reasons why they do not go together to the end of life with a happy ending. First, they were not mature enough to choose a person to love for life. Most of them did not yet have the wisdom and experience to understand each other's hearts. They loved with the impulsive feelings of youth and did not understand much.
  Second, they made the mistake of not devoting themselves to their studies while they were studying, getting distracted and wasting the effort their parents had put into raising and caring for them. It is precisely this silent offence that damages their merit and leads to the break-up.
  I think that someone who dares to fall in love while still studying is either a genius who can study and play at the same time and still pass, or is irresponsible towards their parents and towards their own future.
  I struggle with my coursework with great effort and still it is not enough to satisfy my teachers. If I had to be distracted by love and longing as well, I probably wouldn't graduate. Or I would graduate by some trick and not through real ability. Later, after leaving school, I would work poorly, affecting society's overall progress.

I am writing this letter to set out my position very clearly to you, and I very much hope you will help me not to be pointlessly preoccupied, help me not to be needlessly distracted, and help me concentrate on my studies. I also hope you will concentrate on your studies and graduate with high results as a foundation for your future career, rather than using your mind wrongly during this time.
I will also say frankly that if later I have to choose a boyfriend, the first thing I will ask him is: "Did you have feelings for anyone while you were a student?" If he says yes, I will refuse. If he says no, I will go on to consider other factors.
I would also like to add a P.S.: most of those who put on airs about romance in their school years behave and speak very poorly to their parents when they get home. 👩‍🎓

Often we think that loving someone brings that person happiness, but sometimes it ruins each other's lives. It takes a great deal of wisdom and morality to love in a way that helps each other progress.