“O Ye who are invested with the Bayán! Be ye watchful ...”
O Ye who are invested with the Bayán! Be ye watchful on the Day of Resurrection, for on that Day ye will firmly believe in the Vahíd of the Bayán, though this, even as your past religion which proved of no avail, can in no wise benefit you, unless ye embrace the Cause of Him Whom God shall make manifest and believe in that which He ordaineth. Therefore take ye good heed lest ye shut yourselves out from Him Who is the Fountain-head of all Messengers and Scriptures, while ye hold fast to parts of the teachings which have emanated from these sources. XVII, 15.
“Consider how at the time of the appearance of every ...”
Consider how at the time of the appearance of every Revelation, those who open their hearts to the Author of that Revelation recognize the Truth, while the hearts of those who fail to apprehend the Truth are straitened by reason of their shutting themselves out from Him. However, openness of heart is bestowed by God upon both parties alike. God desireth not to straiten the heart of anyone, be it even an ant, how much less the heart of a superior creature, except when he suffereth himself to be wrapt in veils, for God is the Creator of all things.
Wert thou to open the heart of a single soul by helping him to embrace the Cause of Him Whom God shall make manifest, thine inmost being would be filled with the inspirations of that august Name. It devolveth upon you, therefore, to perform this task in the Days of Resurrection, inasmuch as most people are helpless, and wert thou to open their hearts and dispel their doubts, they would gain admittance into the Faith of God. Therefore, manifest thou this attribute to the utmost of thine ability in the days of Him Whom God shall make manifest. For indeed if thou dost open the heart of a person for His sake, better will it be for thee than every virtuous deed; since deeds are secondary to faith in Him and certitude in His Reality. XVII, 15.