Quoted in Never be Afraid to Dare, Jasion, p188
Your sojourn in Sofia seems to have been on the whole quite successful and Shoghi Effendi trusts that if you persevere in your work many new souls will be awakened. You should not, however, measure the value of your teaching services by the number of those who actually embrace the Cause. For conversion is not an easy process. It often takes a long, a very long time. What is essential for you to do is to present the Message in a comprehensive and adequate manner and let time do the rest.
[To Marion Jack, 30 July 1932]