Not all of us are capable of serving in the same way, but the one way every Bahá'í can spread the Faith is by example. This moves the hearts of people far more deeply than words ever can.
The love we show others, the hospitality and understanding, the willingness to help them, these are the very best advertisements of the Faith. They will want to hear about it when they see these things in our lives.
- Shoghi Effendi (From a letter dated 17 March 1943 written on behalf of Shoghi Effendi to an individual believer; The Compilation of Compilations, vol. II, Living the Life)