June 5

He is very sorry that such undesirable things are every now and then cropping up in ... and discouraging you in your work, keeping you from devoting all your spare time in teaching the Cause and spreading its principles. He does not wish you, however, to lose heart from such things. As the Cause grows its difficulties will increase and its problems will become more numerous. The friends, especially the older ones, should therefore try and stand unmoved by them. In fact the more their difficulties will increase the more they have to take courage and try to solve them. The Master has often said that sorrows are like furrows, the deeper they go the more productive the land becomes. If this problem of ... should be settled other problems will arise. Are the friends to become discouraged or are they to follow the footsteps of the Master and consider them more as chances to show their tenacity of belief and spirit of sacrifice? In short, Shoghi Effendi wishes you to keep on teaching the principles of the Cause no matter what problems may arise. 
- Shoghi Effendi  (From a letter dated 28 December 1925, written on behalf of Shoghi Effendi to an individual believer; printed in ‘The Unfolding Destiny’)