What does Unity through Diversity mean?

"Thus should it be among the children of men! The diversity in the human family should be the cause of love and harmony, as it is in music where many different notes blend together in the making of a perfect chord. If you meet those of different race and colour from yourself, do not mistrust them and withdraw yourself into your shell of conventionality, but rather be glad and show them kindness. Think of them as different coloured roses growing in the beautiful garden of humanity, and rejoice to be among them."

~ Abdu'l-Baha, Paris Talks, p. 53


"And that universal Manifestation will subdue the world by spiritual power, not by war and combat; He will do it with peace and tranquillity, not by the sword and arms; He will establish this Heavenly Kingdom by true love, and not by the power of war. He will promote these divine teachings by kindness and righteousness, and not by weapons and harshness. He will so educate the nations and people that, notwithstanding their various conditions, their different customs and characters, and their diverse religions and races, they will, as it is said in the Bible, like the wolf and the lamb, the leopard, the kid, the sucking child and the serpent, become comrades, friends and companions. The contentions of races, the differences of religions, and the barriers between nations will be completely removed, and all will attain perfect union and reconciliation under the shadow of the Blessed Tree."

~ Abdu'l-Baha, Some Answered Questions, p. 58