"Ex-Baha'is" will spread the message of Baha'u'llah!

Therefore, my purpose is to warn and strengthen you against accusations, criticisms, revilings and derision in newspaper articles or other publications. Be not disturbed by them. They are the very confirmation of the Cause, the very source of upbuilding to the Movement. May God confirm the day when a score of ministers of the churches may arise and with bared heads cry at the top of their voices that the Bahá’ís are misguided. I would like to see that day, for that is the time when the Cause of God will spread. Bahá’u’lláh has pronounced such as these the couriers of the Cause. They will proclaim from pulpits that the Bahá’ís are fools, that they are a wicked and unrighteous people, but be ye steadfast and unwavering in the Cause of God. They will spread the message of Bahá’u’lláh.

http://reference.bahai.org/en/t/ab/PUP/pup-126.html