I have found that the greatest degree of inner tranquility comes from the development of love and compassion. The more we care for the happiness of others, the greater is our own sense of well-being. Cultivating a close, warmhearted feeling for others automatically puts the mind at ease.
When one views the planet Earth from outer space and sees no national boundaries, the prophecy of Teilhard de Chardin is compelling:
The age of nations is past. That task before us, if we would not perish, is to build the earth ... to help hear her wounds.