When your mind is in a state of torpor or when delusive thoughts arise unchecked, compose yourself and recite the Buddha's name aloud a few hundred times. You will then naturally experience a pure, peaceful state. This is because the faculty of hearing is very keen and therefore people are easily influenced by external factors which disturb the mind and lead to errant, delusive thoughts. Thus, you need to recite aloud to control the faculty of hearing and enlighten the mind. When the mind hears only its own sounds, each sound in its totality following upon the one before, all thoughts of right and wrong, what should and should not be done, are naturally abandoned.

~ Taming the Monkey Mind,