If we think only of ourselves, forget about other people, then our minds occupy very small area. Inside that small area, even tiny problem appears very big. But the moment you develop a sense of concern for others, you realize that, just like ourselves, they also want happiness; they also want satisfaction. When you have this sense of concern, your mind automatically widens. At this point, your own problems, even big problems, will not be so significant. The result? Big increase in peace of mind. So, if you think only of yourself, only your own happiness, the result is actually less happiness. You get more anxiety, more fear.
Everyone can understand from natural experience and common sense that affection is crucial from the day of birth; it is the basis of life. The very survival of our body requires the affection of others, to whom we also respond with affection. Though mixed with attachment, this affection is not based on physical or sexual attraction, so it can be extended to all living beings without bias.
The goal is to cultivate in our hearts the concern a dedicated mother feels for her child, and then focus it on more and more people and living beings. This is a heartfelt, powerful love. Such feelings give us a true understanding of human rights, that is not grounded just in legal terms, but rooted deeply in the heart.