Abdul-Baha spoke to the friends gathered at 227 Riverside Dr, In Manhattan, NYC
In Washington, too, we called a meeting of the blacks and whites. The attendance was very large, the blacks predominating. At our second gathering this was reversed, but at the third meeting we were unable to say which color predominated. These meetings were a great practical lesson upon the unity of colors and races in the Bahá'í teaching.
We said in part: The black man must ever be grateful to the white man, for he has manifested great courage and self-sacrifice in behalf of the black race. Four years he fought their cause, enduring severe hardships, sacrificing life, family, treasure, all for his black brother until the great war ended in the proclamation of freedom. By this effort and accomplishment the black race throughout the world was influenced and benefited. Had this not been accomplished, the black man in Africa would still be bound by the chains of slavery. Therefore, his race should everywhere be grateful, for no greater evidence of humanism and courageous devotion could be shown than the white man has displayed. If the blacks of the United States forget this sacrifice, zeal and manhood on the part of the whites, no ingratitude could be greater or more censurable. If they could see the wretched conditions and surroundings of the black people of Africa today, the contrast would be apparent and the fact clearly evident that the black race in America enjoys incomparable advantages. The comfort and civilization under which they live here are due to the white man's effort 113 and sacrifice. Had this sacrifice not been made, they would still be in the bonds and chains of slavery, scarcely lifted out of an aboriginal condition. Therefore, always show forth your gratitude to the white man. Eventually all differences will disappear, and you will completely win his friendship.
God maketh no distinction between the white and the black. If the hearts are pure both are acceptable unto Him. God is no respecter of persons on account of either color or race. All colors are acceptable to Him, be they white, black, or yellow. Inasmuch as all were created in the image of God, we must bring ourselves to realize that all embody divine possibilities. If you go into a garden and find all the flowers alike in form, species and color, the effect is wearisome to the eye. The garden is more beautiful when the flowers are many-colored and different; the variety lends charm and adornment. In a flock of doves some are white, some black, red, blue; yet they make no distinction among themselves. All are doves no matter what the color.
This variety in forms and colorings which is manifest in all the kingdoms is according to creative wisdom and has a divine purpose. Nevertheless, whether the creatures be all alike or all different should not be the cause of strife and quarreling among them. Especially why should man find cause for discord in the color or race of his fellow creature? No educated or illumined mind will allow that this differentiation and discord should exist or that there is any ground for it. Therefore, the whites should be just and kind to the blacks, who in turn should reflect an equal measure of appreciation and gratitude. Then will the world become as one great garden of flowering humanity, variegated and multicolored, rivaling each other only in the virtues and graces which are spiritual.
(Abdu'l-Baha, The Promulgation of Universal Peace, p. 112)