'When one recites the Qur’an throughout the night and day, he will affirm whatever he has memorized. If he does not, he will forget (what he has memorized)!’ (Silsilah as-Saheehah #597) *One should abstain from sinning, for its most apparent harm is that it weakens one’s memory and causes them to forget the knowledge they have learned.
*One should behave appropriately when in the presence of a Sheik (or Qur’an teacher); he should not raise his voice, laugh, or talk excessively.
*One should not recite when the Sheik is preoccupied or tired. The student should be understanding and bear patiently with his Sheik if, at times, he tends to be harsh.
