What follows is my provisional translation (in other words, not official or authorized; see here for more) of a passage from a Tablet of Baháʼuʼlláh, the original text of which is published in Amr va Khalq, vol. 3, p. 471.
The assistance of God and the teaching of His Cause have ever been, and shall always be, dependent on tact and utterance, and utterance must be manifested according to the capacity of each person. Say: O friends! It was revealed aforetime by the Pen of the Most High that ye are to sow the seeds of wisdom and divine recognition in soil that is pure and fertile. Ye are spiritual physicians—true physicians. The people are afflicted with the maladies of ignorance and folly; the illness of each and every one of them must become known and then treated proportionately with the remedy of the Greatest Name. For instance, if a Muslim sick with vain imaginings—whose understanding hath gone no further than matters of leadership and successorship—were, on first encounter, to be told of divinity,* he would surely be overwhelmed . . . Hence, at the outset of this undertaking, he should be spoken to in accordance with the capacity of his heart, that from the state of childhood he may reach the age of maturity.
* Perhaps a reference to the divinity of the Manifestation of God.
A typescript of the original Persian text of this passage appears below.