The significance of this Day and the responsibility of “all the peoples of the world”

This is the Day in which God's most excellent favours 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.... 

- Baha’u’llah  (‘Gleanings from the Writings of Bahá'u'lláh’; The Compilation of Compilations, vol. II, Peace)