LoG #729 plus
USBN #217 March 1949 p4
"Deep as are family ties, we must always remember that the spiritual ties are far deeper; they are everlasting and survive death, whereas physical ties, unless supported by spiritual bonds, are confined to this life. You should do all in your power, through prayer and example, to open the eyes of your family to the Baha'i Faith, but do not grieve too much over their actions. Turn to your Baha'i brothers and sisters who are living with you in the light of the Kingdom. Indeed, the believers have not yet fully learned to draw on each other's love for strength and consolation in time of need. 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 duly draw these mighty forces of love and strength and harmony generated by the Faith."
Shoghi Effendi to Miss Roan Orloff, May 8, 1942
[this is compiled from the two sources listed above]