Think about his other point, missionaries have devoted their lives to the Great Commission to make Christ known and disciple them in the word, all because they knew that the only means of conversion ordained by God was the preaching of the word.
Don't any of you find it strange that it is happening only in this era and not throughout Church History? Martin Luther, John Calvin, William Tyndale, et al, never had dreams, yet they came to the conviction of the true gospel taught in Scripture.