The most burning fire is to question the signs of God, to dispute idly that which He hath revealed...

The most burning fire is to question the signs of God, to dispute idly that which He (Bahá’u’lláh) hath revealed, to deny Him and carry one’s self proudly before Him.
ASL-I-KULLU’L-KHAYR (Words of Wisdom) Tablets of Bahá’u’lláh Revealed After the Kitáb-i-Aqdas

...Gospel and the Qur'an...

Should we look back upon the past, were we to search out the Gospel and the Qur’án, we will readily recognize that neither the Christian nor the Islamic Dispensations can offer a parallel either to the system of Divine Economy so thoroughly established by Bahá’u’lláh...

Shoghi Effendi - The World Order of Bahá’u’lláh

... for the one who chants it, the reward of a hundred martyrs and a service in both worlds

Learn well this Tablet, O Ahmad. Chant it during thy days and withhold not thyself therefrom. For verily, God hath ordained for the one who chants it, the reward of a hundred martyrs and a service in both worlds.

Bahá’u’lláh - Tablet of Ahmad

This is the meaning of the “Day of Resurrection ,”...

This is the meaning of the “Day of Resurrection, ” spoken of in all the scriptures, and announced unto all people. Reflect, can a more precious, a mightier, and more glorious day than this be conceived, so that man should willingly forego its grace, and deprive himself of its bounties, which like unto vernal showers are raining from the heaven of mercy upon all mankind? Having thus conclusively demonstrated that no day is greater than this Day, and no revelation more glorious than this Revelation...

Bahá’u’lláh - The Kitáb-i-Íqán

Be thou as a ... river of life eternal to My loved ones, and be not of those who doubt.

Be thou as a flame of fire to My enemies and a river of life eternal to My loved ones, and be not of those who doubt.

Bahá'u'lláh' - Tablet of Ahmad

...he who turns away from this Beauty hath also turned away from the Messengers of the past...

Be thou assured in thyself that verily, he who turns away from this Beauty hath also turned away from the Messengers of the past and showeth pride towards God from all eternity to all eternity.

Bahá'u'lláh' - Tablet of Ahmad

...appoint one of the existing languages, or a new language, and instruct the children therein...

Their Majesties, the kings - may God assist them - or the counselors [i.e. government ministers] of the earth must consult together, and appoint one of the existing languages, or a new language, and instruct the children therein, in all the schools of the world; and the same must be done with respect to writing also [i.e. a common script]. In such case the earth will be considered as one.

Bahá'u'lláh's Bishárát

The Baha'i concept of the "Most Great Peace" is a condition of the world...

The Baha’i concept of the “Most Great Peace” is a condition of the world in which all nations have united in a permanent accord, abandoning war and re¬garding all countries as one home for all. This alludes to the Biblical eschato¬logical vision of a final, ultimate peace on earth brought about through the potent inspiration or presence of God.

Bahai-writings.com

...that the trustees of the House of Justice must select one tongue out of the present languages

We have formerly commanded, in the tablets, that the trustees of the House of Justice must select one tongue out of the present languages, or a new language, and likewise select one among the various scripts and teach them to children in the schools of the world, so that the whole world may thereby be considered as one native land and one place.

...affairs are therefore entrusted to the HouseofJustice

Inasmuch as for each day and time a particular decree or order is expedient, affairs are therefore entrusted to the House of Justice, so that it may execute that which it deemeth advisable at the time. Those souls who arise to serve the cause sincerely to please God shall be inspired by the invisible inspiration of God. It is incumbent upon all to obey (them, i.e. the House of Justice).

Bahá'u'lláh in Kitab-i-Aqdas (“Most Holy Book”)

The affairs of the people...

The affairs of the people are in the charge of the men of the House of Justice of God. They are the trustees of God among His servants and the sources of command in His countries.

Bahá'u'lláh in Kitab-i-Aqdas (“Most Holy Book”)

If ye differ in a matter, bring it to God...

If ye differ in a matter, bring it to God, so long as the Sun is shining from the Horizon of this heaven; but when He sets, bring it to what He uttered, verily it suffices the worlds.

Bahá'u'lláh in Kitab-i-Aqdas (“Most Holy Book”), paragraph 53

The Lord hath ordained that in every city a House of Justice be established...

The Lord hath ordained that in every city a House of Justice be established wherein shall gather counsellors to the number of Baha [i.e. nine], and should it exceed this number it doth not matter.

Bahá'u'lláh in The Kitáb-i-Aqdas, paragraph 30