the worship of God is acceptable only when

The Bab explains that the worship of God is acceptable only when accompanied by faith in the Manifestation of the age.

-The Bab, Selections 61

No man can obtain everlasting life, unless he embraceth the truth of this inestimable, this wondrous, and sublime Revelation.

-Baha'u'llah, Gleanings 183

The principle of progressive revelation involves recognizing all the Manifestations of God because of their ultimate unity, but it is the Manifestation of the Age Who embodies the legitimacy and truth of all the Revelations.

-Gate of the heart, Nader Saiedi, Page 273