"When the concealment of [Gd] is twofold, it is impossible to find Him: His concealment is hidden." (Rabbi Nachman of Breslov, Likutey Moharan I, 56)
Comment: To a person who does not act according to the Divine Will - but admits it - G-d is concealed. In fact, if He was revealed, that person would not make a transgression! However, Hashem is doubly concealed when an individual acts against His will, thinking that G-d agrees with him.
If a person drives on Shabath - G-d forbid - and think sincerely that the Creator doesn't found that wrong, Hashem is doubly concealed to that person (a concealment within a concealment). Firstly, if G-d was not concealed, he would not drive the holiest day of the week; in a second time, if this concealment was not concealed, he wouldn't think that Hachem shares his opinion.
To overcome this difficult situation, that person must study the Torah aloud. Saying holy words is his way of calling the Master of the world to help him to make disappear this concealed concealment.