October 31

By all means persevere and associate in a friendly spirit with other groups of young people, particularly of a different race or minority nationality, for such association will demonstrate your complete conviction of the oneness of mankind and attract others to the Faith, both young and old alike.

A spirit of prejudice-free, loving comradeship with others is what will open the eyes of people more than any amount of words. Combined with such deeds you can teach the Faith easily. 
- Shoghi Effendi  (From a letter dated 18 June 1945 written on behalf of Shoghi Effendi to the Bahá'ís of Dayton, Oh; The Compilation of Compilations, vol. II, Guidelines for Teaching)