The first principle of Bahá'u'lláh is independent investigation of truth, that is, all the nations of the world have to investigate after truth independently and turn their eyes from the moribund blind imitations of the past ages entirely. Truth is one when it is independently investigated, it does not accept division. Therefore the independent investigation of truth will lead to the
oneness of the world of humanity

Know thou assuredly that the essence of all the Prophets of God is one and the same. Their unity is absolute. God, the Creator, saith: There is no distinction whatsoever among the Bearers of My Message. They all have but one purpose; their secret is the same secret. To prefer one in honour to another, to exalt certain ones above the rest, is in no wise to be permitted. Every true Prophet hath regarded His Message as fundamentally the same as the Revelation of every other Prophet gone before Him.

Another cause of dissension and disagreement is the fact that religion has been pronounced at variance with science. Between scientists and the followers of religion there has always been controversy and strife for the reason that the latter have proclaimed religion superior in authority to science and considered scientific announcement opposed to the teachings of religion. Bahá'u'lláh declared that religion is in complete harmony with science and reason. If religious belief and doctrine is at variance with reason, it proceeds from the limited mind of man and not from God; therefore, it is unworthy of belief and not deserving of attention; the heart finds no rest in it, and real faith is impossible. How can man believe that which he knows to be opposed to reason? Is this possible? Can the heart accept that which reason denies? Reason is the first faculty of man, and the religion of God is in harmony with it. Bahá'u'lláh has removed this form of dissension and discord from among mankind and reconciled science with religion by revealing the pure teachings of the divine reality. This accomplishment is specialised to Him in this Day

Women and men have been and will always be equal in the sight of God. The Dawning-Place of the Light of God sheddeth its radiance upon all with the same effulgence. Verily God created women for men, and men for women. The most beloved of people before God are the most steadfast and those who have surpassed others in their love for God, exalted be His glory.... The friends of God must be adorned with the ornament of justice, equity, kindness and love. As they do not allow themselves to be the object of cruelty and transgression, in like manner they should not allow such tyranny to visit the handmaidens of God. He, verily, speaketh the truth and commandeth that which benefitteth His servants and handmaidens. He is the Protector of all in this world and the next.

And among the teachings of Bahá'u'lláh is that religious, racial, political, economic and patriotic prejudices destroy the edifice of humanity. As long as these prejudices prevail, the world of humanity will not have rest. For a period of 6,000 years history informs us about the world of humanity. During these 6,000 years the world of humanity has not been free from war, strife, murder and bloodthirstiness. In every period war has been waged in one country or another and that war was due to either religious prejudice, racial prejudice, political prejudice or patriotic prejudice. It has therefore been ascertained and proved that all prejudices are destructive of the human edifice. As long as these prejudices persist, the struggle for existence must remain dominant, and bloodthirstiness and rapacity continue. Therefore, even as was the case in the past, the world of humanity cannot be saved from the darkness of nature and cannot attain illumination except through the abandonment of prejudices and the acquisition of the morals of the Kingdom.

The well-being of mankind, its peace and security, are unattainable unless and until its unity is firmly established.

Among other teachings and principles Bahá'u'lláh counsels the education of all members of society. No individual should be denied or deprived of intellectual training, although each should receive according to capacity. None must be left in the grades of ignorance, for ignorance is a defect in the human world. All mankind must be given a knowledge of science and philosophy - that is, as much as may be deemed necessary. All cannot be scientists and philosophers, but each should be educated according to his needs and deserts.

Among the things which are conducive to unity and concord and will cause the whole earth to be regarded as one country is that the divers languages be reduced to one language and in like manner the scripts used in the world be confined to a single script. It is incumbent upon all nations to appoint some men of understanding and erudition to convene a gathering and through joint consultation choose one language from among the varied existing languages, or create a new one, to be taught to the children in all the schools of the world. The day is approaching when all the peoples of the world will have adopted one universal language and one common script. When this is achieved, to whatsoever city a man may journey, it shall be as if he were entering his own home.

One of the most important principles of the Teaching of Bahá'u'lláh is: The right of every human being to the daily bread whereby they exist, or the equalization of the means of livelihood. The arrangements of the circumstances of the people must be such that poverty shall disappear, that everyone, as far as possible, according to his rank and position, shall share in comfort and well-being. We see amongst us men who are overburdened with riches on the one hand, and on the other those unfortunate ones who starve with nothing; those who possess several stately palaces, and those who have nowhere to lay their head. Some we find with numerous courses of costly and dainty food; whilst others can scarce find sufficient crusts to keep them alive. Whilst some are clothed in velvets, furs and fine linen, others have insufficient, poor and thin garments with which to protect them from the cold. This condition of affairs is wrong, and must be remedied. Now the remedy must be carefully undertaken It cannot be done by bringing to pass absolute equality between men.