Yes, that’s right. In this context, “wholly” and “holy” are interchangeable.
Think that the Bahá’í Faith teaches harmony between science and religion? Think again!
Your sciences shall not profit you in this day, nor your arts, nor your treasures, nor your glory. Cast them all behind your backs, and set your faces towards the Most Sublime Word…
Bahá’u’lláh, Epistle to the Son of the Wolf, pg. 97-98
Perhaps Bahá’u’lláh’s actual meaning is not as it appears. Need an authoritative interpretation? Here. Have three:
You see our whole approach to each matter is based on the belief that God sends us divinely inspired Educators; what they tell us is fundamentally true, what science tells us today is true; tomorrow may be entirely changed to better explain a new set of facts.
Shoghi Effendi, Arohanui – Letters to New Zealand, pg. 85
Is not faith but another word for implicit obedience, whole-hearted allegiance, uncompromising adherence to that which we believe is the revealed and express will of God, however perplexing it might first appear, however at variance with the shadowy views, the impotent doctrines, the crude theories, the idle imaginings, the fashionable conceptions of a transient and troublous age?
Shoghi Effendi, The New World Order, Bahá’í Administration, pg. 62
The danger Bahá’í scholars must avoid is the distortion of religious truth, almost forcibly at times, to make it conform to understandings and perceptions current in the scientific world. True Bahá’í scholars should guard against this.
Universal House of Justice, From a letter dated 7 June 1983 to an individual believer
Oh, wait. Pardon me. The Universal House of Justice is not given the authority to interpret the holy scriptures. I suppose if they express an opinion, that must mean that no authoritative interpretation is needed because the scriptures are clear on the subject. After all, they would surely never dare overstep the authority granted them by ‘Abdu’l-Bahá’s Will & Testament. … or is this—legislation?
Think there’s a broad grey area in which believers can excercise their own judgment? Careful now!
In short, the meaning of “He doeth whatsoever He willeth” is that if the Manifestation says something, or gives a command, or performs an action, and believers do not understand its wisdom, they still ought not to oppose it by a single thought, seeking to know why He spoke so, or why He did such a thing. The other souls who are under the shadow of the supreme Manifestations are submissive to the commandments of the Law of God, and are not to deviate as much as a hairsbreadth from it; they must conform their acts and words to the Law of God. If they do deviate from it, they will be held responsible and reproved in the presence of God.
‘Abdu’l-Bahá’, Some Answered Questions, pg. 173
Don’t you dare entertain a doubt, and don’t you dare hesitate!
Were He to decree as lawful the thing which from time immemorial had been forbidden, and forbid that which had, at all times, been regarded as lawful, to none is given the right to question His authority. Whoso will hesitate, though it be for less than a moment, should be regarded as a transgressor.
Bahá’u’llah, The Kitab-i-Aqdas, pg. 77
Take heed lest ye hesitate in recognizing this resplendent Beauty when once He hath appeared in the plenitude of His sovereign might and majesty. He, verily, is the True One, and all else besides Him is as naught before a single one of His servants, and paleth into nothingness when brought face to face with the revelation of His splendours. Hasten, then, to attain the living waters of His grace, and be not of the negligent. As to him who hesitateth, though it be for less than a moment, God shall verily bring his works to naught and return him to the seat of wrath; wretched indeed is the abode of them that tarry!
Bahá’u’lláh, The Summons of the Lord of Hosts, pg. 54
Thanks to Mavaddat Javid for his comprehensive Bahá’í dogmatism compilation.