Bahá'u'lláh -- Announcement to Humanity

The Revelation which, from time immemorial, hath been acclaimed as the Purpose and Promise of all the Prophets of God, and the most cherished Desire of His Messengers, hath now, by virtue of the pervasive Will of the Almighty and at His irresistible bidding, been revealed unto men. The advent of such a Revelation hath been heralded in all the sacred Scriptures. Behold how, notwithstanding such an announcement, mankind hath strayed from its path and shut out itself from its glory.
This is the Day in which God's most excellent favors have been poured out upon men, the Day in which His most mighty grace hath been infused into all created things. It is incumbent upon all the peoples of the world to reconcile their differences, and, with perfect unity and peace, abide beneath the shadow of the Tree of His care and loving-kindness. It behoveth them to cleave to whatsoever will, in this Day, be conducive to the exaltation of their stations, and to the promotion of their best interests. Happy are those whom the all-glorious Pen was moved to remember, and blessed are those men whose names, by virtue of Our inscrutable decree, We have preferred to conceal. Beseech ye the one true God to grant that all men may be graciously assisted to fulfil that which is acceptable in Our sight. Soon will the present-day order be rolled up, and a new one spread out in its stead. Verily, thy Lord speaketh the truth, and is the Knower of things unseen.

Gleanings from the Writings of Bahá'u'lláh,