You must manifest complete love and affection toward all mankind. Do not exalt yourselves above others, but consider all as your equals, recognizing them as the servants of one God. Know that God is compassionate toward all; therefore, love all from the depths of your hearts, prefer all religionists before yourselves, be filled with love for every race, and be kind toward the people of all nationalities.
(‘Abdu'l-Baha, The Promulgation of Universal Peace)