The most vital duty, in this day, is to purify your characters, to correct your manners, and improve your conduct. The beloved of the Merciful must show forth such character and conduct among His creatures, that the fragrance of their holiness may be shed upon the whole world, and may quicken the dead, inasmuch as the purpose of the Manifestation of God and the dawning of the limitless lights of the Invisible is to educate the souls of men, and refine the character of every living man—so that blessed individuals, who have freed themselves from the murk of the animal world, shall rise up with those qualities which are the adornings of the reality of man. The purpose is that earthlings should turn into the people of Heaven, and those who walk in darkness should come into the light, and those who are excluded should join the inner circle of the Kingdom, and those who are as nothing should become intimates of the everlasting Glory. It is that the portionless should gain their share of the boundless sea, and the ignorant drink their fill from the living fount of knowledge; that those who thirst for blood should forsake their savagery, and those who are barbed of claw should turn gentle and forbearing, and those who love war should seek instead for true conciliation; it is that the brutal, their talons razor-sharp, should enjoy the benefits of lasting peace; that the foul should learn that there is a realm of purity, and the tainted find their way to the rivers of holiness.
“A fundamental teaching of Bahá’u’lláh is the oneness of the world of humanity. Addressing mankind, He says, “Ye are all leaves of one tree and the fruits of one branch.” By this it is meant that the world of humanity is like a tree, the nations or peoples are the different limbs or branches of that tree, and the individual human creatures are as the fruits and blossoms thereof. In this way Bahá’u’lláh expressed the oneness of humankind, whereas in all religious teachings of the past the human world has been represented as divided into two parts: one known as the people of the Book of God, or the pure tree, and the other the people of infidelity and error, or the evil tree. The former were considered as belonging to the faithful, and the others to the hosts of the irreligious and infidel—one part of humanity the recipients of divine mercy, and the other the object of the wrath of their Creator. Bahá’u’lláh removed this by proclaiming the oneness of the world of humanity, and this principle is specialized in His teachings, for He has submerged all mankind in the sea of divine generosity. Some are asleep; they need to be awakened. Some are ailing; they need to be healed. Some are immature as children; they need to be trained. But all are recipients of the bounty and bestowals of God.”
Abdu’l-Bahá; Promulgation of Universal Peace, pg 454
The utterance of God is a lamp, whose light is these words: Ye are the fruits of one tree, and the leaves of one branch. Deal ye one with another with the utmost love and harmony, with friendliness and fellowship.
…Consort with all men, O people of Bahá, in a spirit of friendliness and fellowship. If ye be aware of a certain truth, if ye possess a jewel, of which others are deprived, share it with them in a language of utmost kindliness and good-will. If it be accepted, if it fulfil its purpose, your object is attained. If any one should refuse it, leave him unto himself, and beseech God to guide him. Beware lest ye deal unkindly with him. A kindly tongue is the lodestone of the hearts of men. It is the bread of the spirit, it clotheth the words with meaning, it is the fountain of the light of wisdom and understanding…”
Gleanings From the Writings of Bahá’u’lláh, pages 288 & 289
“being at one, in complete dignity and freedom, with all on earth”
O peoples of the world! The Sun of Truth hath risen to illumine the whole earth, and to spiritualize the community of man… This is mercy unalloyed and purest bounty; it is light for the world and all its peoples; it is harmony and fellowship, and love and solidarity; indeed it is compassion and unity, and the end of foreignness; it is the being at one, in complete dignity and freedom, with all on earth.
The Blessed Beauty saith: ‘Ye are all the fruits of one tree, the leaves of one branch.’ Thus hath He likened this world of being to a single tree, and all its peoples to the leaves thereof, and the blossoms and fruits. It is needful for the bough to blossom, and leaf and fruit to flourish, and upon the interconnection of all parts of the world-tree, dependeth the flourishing of leaf and blossom, and the sweetness of the fruit.
For this reason must all human beings powerfully sustain one another and seek for everlasting life; and for this reason must the lovers of God in this contingent world become the mercies and the blessings sent forth by that clement King of the seen and unseen realms. Let them purify their sight and behold all humankind as leaves and blossoms and fruits of the tree of being. Let them at all times concern themselves with doing a kindly thing for one of their fellows, offering to someone love, consideration, thoughtful help. Let them see no one as their enemy, or as wishing them ill, but think of all humankind as their friends; regarding the alien as an intimate, the stranger as a companion, staying free of prejudice, drawing no lines.
In this day, the one favoured at the Threshold of the Lord is he who handeth round the cup of faithfulness; who bestoweth, even upon his enemies, the jewel of bounty, and lendeth, even to his fallen oppressor, a helping hand; it is he who will, even to the fiercest of his foes, be a loving friend. These are the Teachings of the Blessed Beauty, these the counsels of the Most Great Name.
“The truth is that God has endowed man with virtues, powers and ideal faculties of which nature is entirely bereft and by which man is elevated, distinguished and superior. We must thank God for these bestowals, for these powers He has given us, for this crown He has placed upon our heads.
How shall we utilize these gifts and expend these bounties? By directing our efforts toward the unification of the human race. We must use these powers in establishing the oneness of the world of humanity, appreciate these virtues by accomplishing the unity of whites and blacks, devote this divine intelligence to the perfecting of amity and accord among all branches of the human family so that under the protection and providence of God the East and West may hold each other’s hands and become as lovers. Then will mankind be as one nation, one race and kind—as waves of one ocean. Although these waves may differ in form and shape, they are waves of the same sea.”
The Promulgation of Universal Peace page 50