May 31

The religion of God and His divine law are the most potent instruments and the surest of all means for the dawning of the light of unity amongst men. The progress of the world, the development of nations, the tranquillity of peoples, and the peace of all who dwell on earth are among the principles and ordinances of God. Religion bestoweth upon man the most precious of all gifts, offereth the cup of prosperity, imparteth eternal life, and showereth imperishable benefits upon mankind. 
(Bahá'u'lláh, Tablets of Bahá'u'lláh revealed after the Kitáb-i-Aqdas; The Compilation of Compilations, vol. III, Social and Economic Development)