How the servant achieves humility and fear in prayer

Question:
How does one achieve wara' (scrupulousness) and fear? Are there specific people for this wara' and fear, meaning specialists, such that I am unable to attain this fear, especially humility in prayer?

Answer:
My brother, humility and fear are things that Allah places in the heart of the servant. You have no means to achieve this except to make your intention sincere, to be mindful of the greatness of your Lord (Glorified and Exalted is He), to perform what is obligatory upon you of the fard (obligatory) acts, and to stay away from what disturbs your tranquility and fear. Do not enter into it while in the presence of food you desire, nor while you are straining to urinate or defecate. You must free yourself from distractions to enter into prayer so that you may gain fear and tranquility in it. As for if you enter into it while your mind is preoccupied with something, this removes the fear or diminishes it. Yes.