He was very happy to hear from you, and to learn that Green Acre this year was pervaded with a love and harmony that was instrumental in confirming many new souls in the Faith. This love amongst the believers is the magnet which will, above all else, attract the hearts and bring new souls into the Cause. Because obviously the teachings - however wonderful - cannot change the world unless the Spirit of Bahá'u'lláh's love is mirrored in the Bahá'í Communities.
-Shoghi Effendi (From a letter dated 27 October 1944 written on behalf of Shoghi Effendi to an individual believer; The Compilation of Compilations, vol. II, Living the Life)