The Noble Qur`an must be memorised in a place where the eyes, ears and tongue are safeguarded. The windows to the mind are three. If I have a pond and this pond has three spouts to fill it at different places. If I fill in water from all three spouts, the pond will fill with water. If I pour milk into the spouts, the pond will fill with milk. Similarly, the heart is a pond. The three spouts of the heart are the eyes, ears and tongue. The heart will be filled with whatever is poured into it via these three spouts. If sin enters into the heart, it creates a black spot and if goodness enters it, it is filled with Noor (Divine radiance).
The place we choose to memorise must be where our hearing will be safeguarded from Gheebah (backbiting), where our tongues will be safeguarded from Nameemah (slander) and where our sight will be safeguarded from what Almighty Allah has forbidden.
In Turkey, I have seen in some centres for memorising the Noble Qur’an small rooms built by the Ottomans. These rooms have high ceilings for ventilation and were built specifically for those who were revising to enter into contests. These were rooms where students would make firm their revision. This was already thought of approximately 400 years ago.