Ezra Taft Benson (Preach My Gospel p.121 [1988])

I have often said one of the greatest secrets of missionary work is work! If a missionary works, he will get the spirit; if he gets the spirit, he will teach by the spirit; and if he teaches by the spirit, he will touch the hearts of the people and he will be happy. There will be no homesickness, no worrying about families, for all time talents and interests are centered on the work of the ministry. Work, work, work--there is no satisfactory substitute, especially in missionary work.