Bahá’u’lláh instructs Pope Pius IX what he should say to the kings

Exhort thou the kings and say: ‘Deal equitably with men. Beware lest ye transgress the bounds fixed in the Book.’ This indeed becometh thee. 

- Baha’u’llah  (Quoted by Shoghi Effendi in ‘The Promised Day Is Come’)

Bahá’u’lláh counsels Pope Pius IX to “Sell all the embellished ornaments thou dost possess, and expend them in the path of God”

O Supreme Pontiff! Incline thine ear unto that which the Fashioner of moldering bones counseleth thee, as voiced by Him Who is His Most Great Name. Sell all the embellished ornaments thou dost possess, and expend them in the path of God, Who causeth the night to return upon the day, and the day to return upon the night. Abandon thy kingdom unto the kings, and emerge from thy habitation, with thy face set towards the Kingdom, and, detached from the world, then speak forth the praises of thy Lord betwixt earth and heaven. Thus hath bidden thee He Who is the Possessor of Names, on the part of thy Lord, the Almighty, the All-Knowing. 

- Baha’u’llah  (Quoted by Shoghi Effendi in ‘The Promised Day Is Come’)

Bahá’u’lláh tells Pope Pius IX that “The Word which the Son concealed is made manifest…in the form of the human temple”; “The Father is come”

The Word which the Son concealed is made manifest. It hath been sent down in the form of the human temple in this day. Blessed be the Lord Who is the Father! He, verily, is come unto the nations in His most great majesty. Turn your faces towards Him, O concourse of the righteous! ...This is the day whereon the Rock [Peter] crieth out and shouteth, and celebrateth the praise of its Lord, the All-Possessing, the Most High, saying: ‘Lo! The Father is come, and that which ye were promised in the Kingdom is fulfilled!...’ My body longeth for the cross, and Mine head waiteth the thrust of the spear, in the path of the All-Merciful, that the world may be purged from its transgressions.... 

- Baha’u’llah  (Quoted by Shoghi Effendi in ‘The Promised Day Is Come’)

Bahá’u’lláh reminds Pope Pius IX about Jesus, the opposition He faced from the Pharisees and the few “who were destitute of any power amongst men, turned towards His face”

Call thou to remembrance Him Who was the Spirit [Jesus], Who, when He came, the most learned of His age pronounced judgment against Him in His own country, whilst he who was only a fisherman believed in Him. Take heed, then, ye men of understanding heart! Thou, in truth, art one of the suns of the heaven of His names. Guard thyself, lest darkness spread its veils over thee, and fold thee away from His light.... Consider those who opposed the Son [Jesus], when He came unto them with sovereignty and power. How many the Pharisees who were waiting to behold Him, and were lamenting over their separation from Him! And yet, when the fragrance of His coming was wafted over them, and His beauty was unveiled, they turned aside from Him and disputed with Him.... None save a very few, who were destitute of any power amongst men, turned towards His face. And yet today every man endowed with power and invested with sovereignty prideth himself on His Name! In like manner, consider how numerous, in these days, are the monks who, in My Name, have secluded themselves in their churches, and who, when the appointed time was fulfilled, and We unveiled Our beauty, knew Us not, though they call upon Me at eventide and at dawn.... 

- Baha’u’llah  (Quoted by Shoghi Effendi in ‘The Promised Day Is Come’)

Bahá’u’lláh addresses Pope Pius IX

To Pope Pius IX, Bahá’u’lláh revealed the following: “O Pope! Rend the veils asunder. He Who is the Lord of Lords is come overshadowed with clouds, and the decree hath been fulfilled by God, the Almighty, the Unrestrained.... He, verily, hath again come down from Heaven even as He came down from it the first time. Beware that thou dispute not with Him even as the Pharisees disputed with Him [Jesus] without a clear token or proof. On His right hand flow the living waters of grace, and on His left the choice Wine of justice, whilst before Him march the angels of Paradise, bearing the banners of His signs. Beware lest any name debar thee from God, the Creator of earth and heaven. Leave thou the world behind thee, and turn towards thy Lord, through Whom the whole earth hath been illumined.... Dwellest thou in palaces whilst He Who is the King of Revelation liveth in the most desolate of abodes? Leave them unto such as desire them, and set thy face with joy and delight towards the Kingdom.... Arise in the name of thy Lord, the God of Mercy, amidst the peoples of the earth, and seize thou the Cup of Life with the hands of confidence, and first drink thou therefrom, and proffer it then to such as turn towards it amongst the peoples of all faiths.... 

- Shoghi Effendi  (‘The Promised Day Is Come’)