Our visit to this planet is short, so we should use our time meaningfully, which we can do by helping others wherever possible. And if we cannot help others, at least we should try not to create pain and suffering for them.
It is important that when pursing our own self-interest we should be 'wise selfish' and not 'foolish selfish'. Being foolish selfish means pursuing our own interests in a narrow, shortsighted way. Being wise selfish means taking a broader view and recognizing that our own long-term individual interest lies in the welfare of everyone. Being wise selfish means being compassionate.
It may seem unrealistic to think we can ever become free from hatred, but Buddhists have systematic methods for gradually developing a tolerance powerful enough to give such freedom.
Because we all share this planet earth, we have to learn to live in harmony and peace with each other and with nature. This is not just a dream, but a necessity.
The practice of altruism is the authentic way to live as a human being, and it is not just for religious people. As human beings, our purpose is to live meaningful lives, to develop a warm heart. There is meaning in being everyone's friend. The real source of peace amongst our families, friends and neighbours is love and compassion.