1. Reference Essay #4

2. Reference Essay #5
The love and care of those around us serve as the foundation for our survival and growth. Therefore, to lead a better life, we must live with compassion and remove selfishness from our lives.
Selfishness arises as society evolves and people get busier with their own lives and plans, often unintentionally creating a distance between individuals, having less time to care for others, and focusing only on their own interests. At times, selfishness stems from the nature of an individual, where they think only of themselves, ignoring those around them, wanting to take without giving.
Selfishness reflects the indifference and detachment of those who focus solely on their own benefit, disregarding the pain of others. This selfishness leads people to become isolated from society and cultivates feelings of envy and resentment. Those with this trait must change and focus on the collective benefit of the community. Moreover, we should recognize and learn from examples of those who live selflessly, giving their best to society and prioritizing the collective good.
We should celebrate and learn from such individuals. All mistakes can be corrected, and we too can change to become better citizens, loving everyone and always ready to give.

3. Reference Essay #6
There exists a unique and poisonous substance that kills the human soul with bitterness and cruelty. It is born from envy, jealousy, and the cramped space within your heart when living in a community or society.
Selfishness manifests in many ways, such as fearing to share due to the worry of losing out or giving only a weak apology when necessary. But in life, who is happier or more successful than whom? Sharing with others means connecting your heart with stronger bonds of kindness.
In contrast, selfishness hoards everything small enough to wither the roots of the soul. By isolating oneself from relationships, community, and the warmth of humanity, selfishness weakens connections. Moreover, it is a virus that hinders the progress of human civilization, most evident in its aftermath — the disease of indifference. Focusing only on oneself without regard for others can lead to familial and societal tragedies, where conflicts arise over words or actions, or over inheritance disputes between relatives.
We must condemn those who are deeply selfish, support those weakened by this virus, and celebrate the kindness found in others. Life will be filled with happiness if we confront selfishness with a strong spirit, but choosing to pursue it will inevitably lead to resentment.

4. Reference Essay #7
A selfish lifestyle is a harmful behavior that deserves criticism. It diminishes love and leaves the soul dry, focusing solely on oneself without considering others.
People are often preoccupied with their own lives, prioritizing personal benefits while ignoring the welfare of the community. A selfish person seeks to exploit others for their own purposes and feels envy when others succeed. In difficult and unfair situations, the selfish individual shows no empathy or compassion. They fail to recognize the spirit of self-sacrifice for the greater good, the love for fellow humans, and the importance of sharing.
As selfishness spreads among some individuals, it leads to moral decay. The soul of the selfish person becomes withered, isolated, and forgotten by others. When selfishness becomes widespread in society, traditional moral values fade and are lost. Even more dangerously, the rise of individualism eventually creates a society devoid of humanity. We cannot live by merely accepting the love and concern others offer us as if it were a given. Relationships cannot last without effort from both sides. Will people be willing to help someone who never cares about others? Does a selfish person, only thinking of themselves, deserve the genuine kindness of others?
Therefore, now more than ever, we must fight to eliminate selfishness from both ourselves and society.

5. Reference Essay #1
As society continues to evolve in a modern direction, people are becoming busier, racing against time. It seems that we no longer share the same emotional connections as we once did, instead adopting an indifferent lifestyle where only self-interest matters. This is also the reason why the 'selfish' disease is becoming more widespread today.
Selfishness means focusing solely on oneself and one’s own interests, being indifferent, detached, and unconcerned with the pain or suffering of others. A selfish person is emotionally distant, only caring about their own needs and desires. The root of selfishness lies in a society where individuals are increasingly absorbed in their own lives, their own plans, often creating a distance between people and reducing the time they spend caring for others. At times, selfishness can also be an inherent trait in a person, where they care only for themselves and are oblivious to the needs of those around them, preferring to take rather than give. Furthermore, selfishness can stem from influences within one's surroundings. If people around you only care about themselves, without sharing or empathizing, such behavior can spread and shape others into being more closed off and self-centered.
However, there are still many people who possess kind hearts, who live with compassion, care, and are willing to share with others. These individuals and their positive messages need to be shared and spread more within society, so that others can learn from their example.
Each of us has the power to choose how we live, how we behave, and how we interact with others. Therefore, live fully, so that when you look back, there will be no regrets. Live by the philosophy that what you give is what endures.

6. Reference Essay #2
Friendship is an easy bond to form but equally easy to lose. Therefore, we must cherish and protect it. There are many factors that help build a beautiful friendship, but one negative influence can easily destroy what we've carefully nurtured – selfishness. As the poet La Fontaine once said: 'Selfishness is the poison that kills friendship.'
What is selfishness? It is the mindset of only caring about oneself, focusing on personal interests, living indifferently and coldly toward others. It is like a cruel beast, eating away inside us, eroding the soul and turning us into mere puppets of selfishness.
People with selfish traits tend to isolate themselves, living in loneliness behind walls they’ve built. They do not know how to love their family, friends, or those around them, but they are obsessed with protecting and loving themselves. These individuals are often meticulous, breaking things down to the smallest details, to the point of excess.
When it comes to their precious belongings, their selfishness becomes even more apparent. They won’t allow anyone to touch them, guarding these things with an overly strong defense. If someone dares to break through this barrier, the selfish person might act irrationally in a way that no one could have predicted. However, they forget that the more tightly they hold onto something, the greater the chance of losing it. Sometimes, we must let go to allow freedom.
It is widely recognized that selfishness is a negative trait, rejected by society, and it often leads to unfortunate consequences. But selfishness seems to be something that people cannot avoid, like a deadly virus. When a person lives only for themselves, seeking personal gain without concern for others, they become isolated from society. They are pushed to the margins, rejected, and ignored because they contribute nothing to the community. They become lonely, disconnected, and despised, like unnecessary burdens to society. Selfishness is the root of all cruelty.
However, is selfishness truly always a flaw? In love, a certain amount of selfishness can be beneficial. Perhaps, in love, a little selfishness might help both people, but not everyone knows how to strike that balance. Some become so selfish that they cannot accept even the smallest threats to their relationship. They imprison their loved ones in an invisible cage. This only makes the person feel frustrated and even more determined to leave. Sometimes, we need to let them go and allow them the freedom to live as they wish.
The selfish way of living that many adopt has led to behaviors that lack humanity, where people become indifferent to the world around them. This is called a life of apathy. Many examples of this can be seen today. Recently, on social media platforms like Facebook, we have seen appalling events where people’s selfishness was the cause. Take, for instance, the 'beer party' incident in Dong Nai in 2014 or the disturbing videos of accident victims, where people took pictures of those suffering to gain cheap likes and comments.
Even worse, selfishness led to a tragedy in Bình Phước in July 2015, where three young men, once kind and gentle, committed a heinous crime driven by personal vendettas. Selfishness has given rise to many modern-day afflictions, including a growing number of young people suffering from narcissism and social withdrawal. They live in isolation, shunned by others. These people hold tightly to what is theirs, yet disregard what others may need, leading to mutual disdain.
Selfishness is a deeply destructive trait that must be eradicated from our society. As students, we must focus on our studies, foster unity in our classes, and nurture honest and lasting friendships.

7. Bài tham khảo số 3
Everyone needs friends in life. There is a saying that goes, 'A true friend is the one who comes to you when you’re in trouble, not just when you’re happy.' Indeed, a real friendship cannot thrive on selfishness, exploitation, or indifference. A friend is someone who shares both your joys and your sorrows. It is no coincidence that it is said, 'Selfishness is the poison that kills friendship.'
What is selfishness? It is a negative trait. A selfish person is someone who only cares about their own interests, without considering the feelings or well-being of others. This is the complete opposite of friendship, which is built on equality and mutual care in both happy and difficult times. 'Selfishness is the poison that kills friendship' compares selfishness in friendship to a deadly poison that has severe consequences. The poison extracted from selfishness slowly destroys friendship, leaving behind emotional scars. It is not an exaggeration to say that 'selfishness is the poison that kills friendship.' Clearly, selfishness cannot coexist with the concept of true friendship, as genuine friendship cannot tolerate selfishness. Friendship is measured by empathy, sharing both the good and the bad. A selfish friend will pull the friendship down to nothing. A relationship where one person constantly asks 'What do I get out of this?' or 'I deserve more' cannot offer the kind of equal sharing that friendship requires. If you’re not there for a friend in their time of trouble because you don’t want to share in their pain, how can there be true empathy and mutual support? In one group of friends, there might be a member who struggles academically. The others, afraid of losing their own position of prominence, avoid helping the struggling friend. When no one can find the willingness to share or empathize, the friendship begins to crack. This fear of losing one’s standing in the group is a selfish attitude, focused only on personal gain without considering the needs of others. In contrast, another group of friends might share their happiness and rewards freely, but when one of them falls ill, no one shows up to support them. In such situations, people often say, 'They always gathered when something good happened, but now that there’s trouble, no one is around.' If you’re only there for the good times and avoid the difficult ones, that is a selfish friendship. These selfish traits in friendship will always eventually reveal themselves. It’s devastating because it makes you feel like you’ve chosen the wrong friends. Selfishness creates distance between friends, makes it impossible to understand one another, and destroys the purity of the relationship. Eventually, the friendship turns cold, devoid of love and care. The inevitable result is a broken friendship, which may even turn into animosity that lasts a lifetime.
Everyone has selfish tendencies, but can those tendencies overcome the foundational requirements of friendship? How can we reduce our selfishness to a level where it’s harmless, even endearing? The key is for each person to learn how to balance their own personality with the emotions of friendship, making sure that selfishness does not poison the relationship. Selfishness in friendship often comes from not understanding what friendship truly is, from failing to address one's own flaws and practicing them in relationships; it comes from thinking that friends should always be 'better' than oneself, or fearing requests for help or sharing difficulties. As the saying goes, 'Near ink, you’ll turn black; near light, you’ll shine.' A person who is selfish but wants to improve their friendship is commendable. Likewise, a friendship that accepts a selfish person in order to help them change is also worth praising. Whether selfishness becomes a poison depends on how we face it.
Friendship is a sacred bond that should be nurtured and protected. The true foundation of friendship is care, sharing, empathy, and sacrifice. These are the strongest building blocks for a lasting friendship. A friendship will become a hollow shell if each member fails to overcome their selfishness and allows it to become the poison that destroys the relationship. Selfishness and friendship will eliminate each other if we understand how to behave in a relationship. Friendship will die if selfishness grows too large, and selfishness will die if friendship is strong enough to crush it. Remember: 'Selfishness is the poison that kills friendship.'

