“Enq: I have heard you say that the identity of our physical origin is proved by science, that of our spiritual origin by the Wisdom-Religion. Yet we do not find Darwinists exhibiting great fraternal affection.
Theo: Just so. This is what shows the deficiency of the materialistic systems, and proves that we Theosophists are in the right. The identity of our physical origin makes no appeal to our higher and deeper feelings.
Matter, deprived of its soul and spirit, or its divine essence, cannot speak to the human heart. But the identity of the soul and spirit, of real, immortal man, as Theosophy teaches, us once proven and deep- rooted in our hearts, would lead us far on the road of real charity and brotherly goodwill.
Enq: But how does Theosophy explain the common origin of man?
Theo: By teaching that the root of all nature, objective and subjective, and everything else in the universe, visible and invisible, is, was, and ever will be one absolute essence, from which all starts, and into which everything returns.
This is Aryan philosophy, fully represented only by the Vedantins, and the Buddhist system. With this object in view, it is the duty of all Theosophists to promote in every practical way, and in all countries, the spread of non-sectarian education.”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 