Answered by Sayyidi Habib Umar bin Hafiz (may Allah protect him and benefit us by him)
Some scholars mention that if someone remembers Allah without being able to hear himself then these adhkar do not count, although he is rewarded for them. Please clarify this. Is it enough for us to move our tongues when reading the adhkar even if we cannot hear ourselves?
This relates to adhkar which are either obligatory or recommended, such as the adhkar in the prayer. Someone must read these adhkar so that they can hear themselves in order for it to valid and to attain the reward. As for adhkar that someone reads outside the prayer and on their own, there is no need for people to hear themselves. In fact, we hope that people reach a state in which the dhikr is so dominant that there are no longer letters associated with it and beyond that that the one remembering is no longer conscious of the fact that he is in remembrance because he is truly present with the One Being Remembered, exalted is He.