The speech of the caller should mainly have the following features:
One, the caller to Allah will analyze the interpretation of the Qur'an in its own language by serving the verses of the Qur'an and the words of the Prophet (peace be upon him). For this, the caller must be qualified to read the Qur'an in its authentic form.
Second, the quality of the caller's language must be similar to that of the listener. Speak in simple, straightforward and clear language.
Third, the argument needs to be reinforced by using arguments from various patterns of the universe and human existence without resorting to logical arguments. It is necessary to open the horizon of their thoughts by simple argument without confusing the listeners by creating a fume of argument.
Four, speak in moderation. Irresponsible speech and provocative language should be avoided.