There is a difference between character and faith; it is often hard to accept this fact and put up with it, but the fact that a person may believe in and love the Cause – even being ready to die for it—and yet not have a good personal character or possess traits at variance with the teachings. We try to change, to let the Power of God help recreate us make us true Bahá’ís in deed as well as in belief. But the process is slow, sometimes it never happened the individual does not try hard enough. But these cause us suffering and are a test to us in our fellow-believers, most especially if we love him and have been their teacher!
(Universal House of Justice, Lights of Guidance, p. 75)