Mr. Taherzadeh speaks in English adding his own Persian translation between comments.
Among Baha’u’llah’s children Abdu’l-Baha and Bahiyyih Khanum became great spiritual giants. He gives examples of how an insignificant person becomes a spiritual giant when they are devoted to teaching the Faith. None of the other children of Baha’u’llah achieved such high spiritual stations. Mirza Muhammad Ali—one of Baha’u’llah’s children—was endowed with great capacity; but he didn’t became a spiritual giant; instead he became a despicable Covenant-Breaker.
When you teach the Baha’i Faith and obey His commands you will be confirmed by the divine assistance of Baha’u’llah. Your own efforts without Baha’u’llah’s confirmations is useless. If you want to draw the power and energy from the Divine Source you must rise to teach the faith with self-effacement. Without making the effort Baha’u’llah doesn’t promise assistance. It is the Law of God that you must take the first step, then He will come to assist you.