" ... in the words of Bahá’u’lláh, the first teaching is the oneness of the world of humanity."

... "It is evident, then, that each elemental atom of the universe is possessed of a capacity to express all the virtues of the universe. This is a subtle and abstract realization. Meditate upon it, for within it lies the true explanation of pantheism. From this point of view and perception pantheism is a truth, for every atom in the universe possesses or reflects all the virtues of life, the manifestation of which is effected through change and transformation. Therefore, the origin and outcome of phenomena is, verily, the omnipresent God; for the reality of all phenomenal existence is through Him. There is neither reality nor the manifestation of reality without the instrumentality of God. Existence is realized and possible through the bounty of God, just as the ray or flame emanating from this lamp is realized through the bounty of the lamp, from which it originates. Even so, all phenomena are realized through the divine bounty, and the explanation of true pantheistic statement and principle is that the phenomena of the universe find realization through the one power animating and dominating all things, and all things are but manifestations of its energy and bounty. The virtue of being and existence is through no other agency. Therefore, in the words of Bahá’u’lláh, the first teaching is the oneness of the world of humanity.

When the man who is spiritually sagacious and possessed of insight views the world of humanity, he will observe that the lights of the divine bounty are flooding all mankind, just as the lights of the sun shed their splendor upon all existing things. All phenomena of material existence are revealed through the ray emanating from the sun. Without light nothing would be visible. Similarly, all phenomena in the inner world of reality receive the bounties of God from the source of divine bestowal. This human plane, or kingdom, is one creation, and all souls are the signs and traces of the divine bounty. In this plane there are no exceptions; all have been recipients of their bestowals through the heavenly bounty. Can you find a soul bereft of the nearness of God? Can you find one whom God has deprived of its daily sustenance? This is impossible. God is kind and loving to all, and all are manifestations of the divine bounty. This is the oneness of the world of humanity." ...

`Abdu'l-Bahá, The Promulgation of Universal Peace, pp. 285-286 

27 August 1912 
(excerpt from) Talk at Metaphysical Club 
Boston, Massachusetts