The Buddha said, Hatred is never appeased by hatred here in this world. By non-hatred alone is hatred appeased. Thus, we love ourselves best. But we must expand this love to wider dimensions if we wish for communal peace or for peace in the world. This is a concept of non-violence in Buddhism.
Peace is a process of love which can draw the whole of humanity into a harmonious union.
Love without expecting to gain advantage in return is real love. According to the Buddha, everything has a cause and an effect. Cause and effect are interdependent. All that exists one day will cease to exist. We can and should love others, but we should not be attached to anything or any person.