Shoghi Effendi: High Endeavors, p. 26
83. It is not enough for the friends to make the excuse that their best teachers and their exemplary believers have arisen and answered the call to pioneer. A "best teacher" and an "exemplary believer" is ultimately neither more nor less than an ordinary Bahá’í who has consecrated himself to the work of the Faith, deepened his knowledge and understanding of its Teachings, placed his confidence in Bahá’u’lláh, and arisen to serve Him to the best of his ability. This door is one which we are assured will open before the face of every follower of the Faith who knocks hard enough, so to speak. When the will and the desire are strong enough, the means will be found and the way opened either to do more work locally, to go to a new goal town within the United States, or to enter the foreign pioneer field...
Not only must your Body provide the encouragement and leadership required, and stimulate the friends to arise and play their part, but the Local Assemblies must likewise do everything in their power to help the friends to go forth and attain their objectives. Each individual Bahá’í must likewise feel that it is his personal duty to the Cause at this time and his greatest privilege, and must ask himself what he can do during the coming six years, beginning now, to hasten the attainment of the goals of the World Crusade. The Bahá’ís are the leaven of God, which must leaven the lump of their nation. In direct ratio to their success will be the protection vouchsafed, not only to them but to their country.
From a letter dated 21 September 1957 written on behalf of Shoghi Effendi to the National Spiritual Assembly of the United States; revised July 1990; Living the Life, p. 27; Guidelines for Teaching, p. 326
84. "...The Cause of God is endowed with tremendous powers, and the reason the believers do not gain more from it is because they have not learned to draw fully on these mighty forces of love and strength and harmony generated by the Faith."