The first duty prescribed by God for His servants is the recognition of Him Who is the Dayspring of His Revelation and the Fountain of His laws, Who representeth the Godhead in both the Kingdom of His Cause and the world of creation. Whoso achieveth this duty hath attained unto all good; and whoso is deprived thereof hath gone astray, though he be the author of every righteous deed. It behoveth every one who reacheth this most sublime station, this summit of transcendent glory, to observe every ordinance of Him Who is the Desire of the world. These twin duties are inseparable. Neither is acceptable without the other. Thus hath it been decreed by Him Who is the Source of Divine inspiration.

O Emperor of Austria! He Who is the Dayspring of God’s Light dwelt in the prison of 'Akká at the time when thou didst set forth to visit the Aqsá Mosque. Thou passed Him by, and inquired not about Him by Whom every house is exalted and every lofty gate unlocked. We, verily, made it a place whereunto the world should turn, that they might remember Me, and yet thou hast rejected Him Who is the Object of this remembrance, when He appeared with the Kingdom of God, thy Lord and the Lord of the worlds. We have been with thee at all times, and found thee clinging unto the Branch and heedless of the Root. Thy Lord, verily, is a witness unto what I say. We grieved to see thee circle round Our Name, whilst unaware of Us, though We were before thy face. Open thine eyes, that thou mayest behold this glorious Vision, and recognize Him Whom thou invokest in the daytime and in the night season, and gaze on the Light that shineth above this luminous Horizon.

Say: O King of Berlin! Give ear unto the Voice calling from this manifest Temple: "Verily, there is none other God but Me, the Everlasting, the Peerless, the Ancient of Days." Take heed lest pride debar thee from recognizing the Dayspring of Divine Revelation, lest earthly desires shut thee out, as by a veil, from the Lord of the Throne above and of the earth below. Thus counselleth thee the Pen of the Most High. He, verily, is the Most Gracious, the All-Bountiful. Do thou remember the one [Napoleon III] whose power transcended thy power, and whose station excelled thy station. Where is he? Whither are gone the things he possessed? Take warning, and be not of them that are fast asleep. He it was who cast the Tablet of God behind him when We made known unto him what the hosts of tyranny had caused Us to suffer. Wherefore, disgrace assailed him from all sides, and he went down to dust in great loss. Think deeply, O King, concerning him, and concerning them who, like unto thee, have conquered cities and ruled over men. The All-Merciful brought them down from their palaces to their graves. Be warned, be of them who reflect.

Be watchful lest the concerns and preoccupations of this world prevent you from observing that which hath been enjoined upon you by Him Who is the Mighty, the Faithful. Be ye the embodiments of such steadfastness amidst mankind that ye will not be kept back from God by the doubts of those who disbelieved in Him when He manifested Himself, invested with a mighty sovereignty. Take heed lest ye be prevented by aught that hath been recorded in the Book from hearkening unto this, the Living Book, Who proclaimeth the truth: "Verily, there is no God but Me, the Most Excellent, the All-Praised." Look ye with the eye of equity upon Him Who hath descended from the heaven of Divine will and power, and be not of those who act unjustly.

the sweet-smelling savour of My garment
This is an allusion to the story of Joseph in the Qur’án and the Old Testament, in which Joseph’s garment, brought by his brothers to Jacob, their father, enabled Jacob to identify his beloved long-lost son. The metaphor of the fragrant “garment” is frequently used in the Bahá’í­ Writings to refer to the recognition of the Manifestation of God and His Revelation.
Bahá’u’lláh, in one of His Tablets, describes Himself as the “Divine Joseph” Who has been “bartered away” by the heedless “for the most paltry of prices”. The Báb, in the Qayyúmu’l-Asmá’, identifies Bahá’u’lláh as the “true Joseph” and forecasts the ordeals that He would endure at the hands of His treacherous brother (see note 190). Likewise, Shoghi Effendi draws a parallel between the intense jealousy which the preeminence of ‘Abdu’l-Bahá had aroused in His half-brother, Mí­rzá Muhammad-‘Alí­, and the deadly envy "which the superior excellence of Joseph had kindled in the hearts of his brothers".

Take heed lest ye be prevented by aught that hath been recorded in the Book from hearkening unto this, the Living Book
The “Book” is the record of the revealed Word of the Manifestations of God. The “Living Book” is a reference to the Person of the Manifestation.
These words contain an allusion to a statement of the Báb in the Persian Bayán about the “Living Book”, which He identifies as Him Whom God will make manifest. In one of His Tablets Bahá’u’lláh Himself states: “The Book of God hath been sent down in the form of this Youth.”
In this verse of the Aqdas, and again in paragraph 168 of the Aqdas, Bahá’u’lláh refers to Himself as the “Living Book”. He cautions the “followers of every other Faith” against seeking “reasons in their Holy Books” for refuting the utterances of the “Living Book”. He admonishes the people not to allow what has been recorded in the “Book” to prevent them from recognising His Station and from holding fast to what is in this new Revelation.