Lack of understanding of the true nature of happiness, it seems to me, is the principal reason why people inflict sufferings on others. They think either that the other's pain may somehow be a cause of happiness for themselves or that their own happiness is more important, regardless of what pain it may cause. But this is shortsighted. No one truly benefits from causing harm to another sentient being. . . . . In the long run causing others misery and infringing their rights to peace and happiness result in anxiety, fear, and suspicion within oneself.
In the Buddha's life story we see the three stages of practice: Morality comes first, then concentrated meditation, and then wisdom. And we see that the path takes time.
In our concern for others, we worry less about ourselves. When we worry less about ourselves an experience of our own suffering is less intense. What does this tell us? Firstly, because our every action has a universal dimension, a potential impact on others' happiness, ethics are necessary as a means to ensure that we do not harm others. Secondly, it tells us that genuine happiness consists in those spiritual qualities of love, compassion, patience, tolerance and forgiveness and so on. For it is these which provide both for our happiness and others' happiness.
We may now have reached a point where this gap in our make-up has become unsustainable; partly because what in the past would have counted as material plenty has become the norm for the majority in much of the world; and partly because the slow retreat of religion that coincided with the spread of a capitalist economy has left a gaping hole in millions of people's lives. (Geoff Mulgan)
Genuine human friendship is on the basis of human affection, irrespective of your position. Therefore, the more you show concern about the welfare and rights of others, the more you are a genuine friend. The more you remain open and sincere, then ultimately more benefits will come to you. If you forget or do not bother about others, then eventually you will lose your own benefit.