The oneness of the world of humanity is a Teaching of Baha’u’llah, for Baha’u’llah addresses Himself to mankind, saying: “Ye are all the leaves of one tree and the drops of one ocean.” That is, the world of human existence is no other than one tree, and the nations or peoples are like unto different branches thereof. Thus Baha’u’llah presented the fact of the oneness of the world of humanity, while in all the past religious books humanity has been divided into two parts, one part looked upon as belonging to the faithful, the other part as belonging to the irreligious and infidel; the first part consigned to the Mercy of their Creator, the second part considered as objects of the Creator’s Wrath. But His Holiness Baha’u’llah proclaimed the Oneness of the world of humanity, and this Teaching is unique to the Teachings of Baha’u’llah, for He submerged all mankind in the sea of Divine Generosity. At most, some of the people are asleep—they need to be awakened. Some are ill—they need to be healed. Some are children—they need to be trained.
A second Teaching newly revealed by Baha’u’llah is this: the injunction to investigate the Truth—that is, men are commanded not to follow blindly the ways of their ancestors. Nay, each must see with his own eyes, hear with his own ears, investigate the Truth for himself that he may attain the Truth by himself. – Abdul Baha
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