August 30

…Bahá’u’lláh has proclaimed to the world the solidarity of nations and the oneness of humanity. Addressing all mankind He has said, “Ye are all leaves of one tree and the drops of one sea.” The world of humanity has been expressed by Him as a unit—as one family. 
- ‘Abdu’l-Baha  (From a talk, Washington DC, 20 April 1912; ‘The Promulgation of Universal Peace: Talks Delivered by 'Abdu'l-Bahá during His Visit to the United States and Canada in 1912’)