Irresistible power of the Cause of Baha'u'llah

We read few paragraphs from Baha'u'llah's book; Book of the River, and wanted to share few points:

"Among the Writings of Bahá'u'lláh revealed in Baghdad is the Sahifiy-i-Shattiyyih (Book of the River)..... In it Bahá'u'lláh speaks about the irresistible power of the Cause of God and its sovereignty. Alluding to the Tigris which runs through Baghdad, He likens the onward march of the Faith to the flow of that river. Just as no obstacle, whether a fortified building or a mighty wall, can withstand the onrushing force of the water, or hold back its progress, so none of the enemies of the Cause, however fierce their onslaught or determined their opposition, can halt the advance of this resistless Faith of God. It will, in spite of all opposition, press onward, tear down every obstacle and ultimately establish its ascendancy over its adversaries. Similarly, the Cause of God will break up old and time-honoured institutions and will not allow any man, regardless of his rank or position, to stand in its way.

A cursory review of the history of the Faith will demonstrate the irresistible power of the Cause of Bahá'u'lláh. From the time of its inception this Faith had been oppressed by the civil and ecclesiastical authorities in the land of its birth. Its youthful Herald, the Báb, Who ushered in the dawn of a New Day and gave the glad-tidings of the coming of 'Him Whom God shall make manifest' (Bahá'u'lláh), was publicly martyred. Its Founder, Bahá'u'lláh, was imprisoned and exiled to far-off lands. For almost half a century He and His family were subjected to inhuman cruelties and hardships. No less than twenty  106  thousand of its heroes were put to death in tragic circumstances and the remainder of its followers were persecuted all their lives.

Yet, the Faith of Bahá'u'lláh, supported by the unseen hosts of the Kingdom, triumphed over its adversaries and penetrated into every part of the world. 

Today its light has been diffused to every corner of the earth, its healing Message has reached almost every stratum of human society and people are responding to it in ever increasing numbers. Its adherents, enrolled from all the nations of the world, representing every race, colour and class, are actively engaged in the erection of the framework of Bahá'u'lláh's New World Order for mankind. Such achievements bear ample testimony to the fulfillment of the words of Bahá'u'lláh revealed in this Tablet over a century ago.

Bahá'u'lláh has also used the analogy of the river to demonstrate another point. He mentions that the outpourings of God's bounty are vouchsafed to all creation equally, but that every created thing receives them in accordance with its capacity. 

(Adib Taherzadeh, The Revelation of Baha'u'llah)