“In the present state of society, especially in so-called civilized countries, we are continually brought face to face with the fact that large numbers of people are suffering from misery, poverty, and disease.

“Their physical condition is wretched, and their mental and spiritual faculties are often almost dormant. On the other hand, many persons at the opposite end of the social scale are leading lives of careless indifference, material luxury, and selfish indulgence.

“Neither of these forms of existence is mere chance. Both are the effects of the conditions which surround those who are subject to them, and the neglect of social duty on the one side is most closely connected with the stunted and arrested development on the other.

“In sociology, as in all branches of true science, the law of universal causation holds good. But this causation necessarily implies, as its logical outcome, that human solidarity on which Theosophy so strongly insists.

“If the action of one reacts on the lives of all, and this is the true scientific idea, then it is only by all men becoming brothers and all women sisters, and by all practicing in their daily lives true brotherhood and true sisterhood, that the real human solidarity, which lies at the root of the elevation of the race, can ever be attained.

“It is this action and interaction, this true brotherhood and sisterhood, in which each shall live for all and all for each, which is one of the fundamental Theosophical principles that every Theosophist should be bound, not only to teach, but to carry out in his or her individual life.”

http://www.theosociety.org/pasadena/key/key-12.htm